[311] Mr. Chief Justice Warren
delivered the opinion of the Court.
Alabama, together with every other State, Puerto Rico, the Virgin Islands, the District of Columbia, and Guam, participates in the Federal Government’s Aid to Families With Dependent Children (AFDC) program, which was established by the Social Security Act of 1935.1 49 Stat. 620, as amended, 42 U. S. C. §§301-1394. This appeal presents the question whether a regulation of the Alabama Department of Pensions and Security, employed in that Department’s administration of the State’s federally funded AFDC program, is consistent with Subchapter IV of the Social Security Act, 42 U. S. C. §§ 601-609, and with the Equal Protection Clause of the Fourteenth Amendment. At issue is the validity of Alabama’s so-called “substitute father” regulation which denies AFDC payments to the children of a mother who “cohabits” in or outside her home with any single or married able-bodied man. Appellees brought this class action against appellants, officers, and members of the Alabama Board of Pensions and Security, in the United States District Court for the Middle District of Alabama, under 42 U. S. C. § 1983,2 seeking declaratory and in-junctive relief. A properly convened three-judge Dis[312] trict Court3 correctly adjudicated the merits of the controversy without requiring appellees to exhaust state administrative remedies,4 and found the regulation to be inconsistent with the Social Security Act and the Equal Protection Clause.5 We noted probable jurisdiction, 390 [313] U. S. 903 (1968), and, for reasons which will appear, we affirm without reaching the constitutional issue.
I.
The AFDC program is one of three major categorical public assistance programs established by the Social Security Act of 1935. See U. S. Advisory Commission Report on Intergovernmental Relations, Statutory and Administrative Controls Associated with Federal Grants for Public Assistance 5-7 (1964) (hereafter cited as Advisory Commission Report). The category singled out for welfare assistance by AFDC is the “dependent child,” who is defined in § 406 of the Act, 49 Stat. 629, as amended, 42 U. S. C. § 606 (a) (1964 ed., Supp. II), as an age-qualified6 “needy child . . . who has been deprived of parental support or care by reason of the death, continued absence from the home, or physical or mental incapacity of a parent, and who is living with” any one of several listed relatives. Under this provision, and, insofar as relevant here, aid can be granted only if “a parent” of the needy child is continually absent from the home.7 Alabama considers a man who qualifies as a “substitute father” under its regulation to be a nonabsent parent within the federal statute. The State therefore denies aid to an otherwise eligible needy child on the basis that his substitute parent is not absent from the home.
Under the Alabama regulation, an “able-bodied man,, married or single, is considered a substitute father of all [314] the children of the applicant . . . mother” in three different situations: (1) if “he lives in the home with the child’s natural or adoptive mother for the purpose of cohabitation”; or (2) if “he visits [the home] frequently for the purpose of cohabiting with the child’s natural or adoptive mother”; or (3) if “he does not frequent the home but cohabits with the child’s natural or adoptive mother elsewhere.” 8 Whether the substitute father is actually the father of the children is irrelevant. It is also irrelevant whether he is legally obligated to support the children, and whether he does in fact contribute to their support. What is determinative is simply whether he “cohabits” with the mother.9
The testimony below by officials responsible for the administration of Alabama’s AFDC program establishes that “cohabitation,” as used in the regulation, means essentially that the man and woman have “frequent” or “continuing” sexual relations. With regard to how frequent or continual these relations must be, the testimony is conflicting. One state official testified that the regulation applied only if the parties had sex at least once a week; another thought once every three months would suffice; and still another believed once every six months sufficient. The regulation itself provides that pregnancy or a baby under six months of age is prima facie evidence of a substitute father.
[315] Between June 1964, when Alabama’s substitute father regulation became effective, and January 1967, the total number of AFDC recipients in the State declined by about 20,000 persons, and the number of children recipients by about 16,000, or 22%. As applied in this case, the regulation has caused the termination of all AFDC payments to the appellees, Mrs. Sylvester Smith and her four minor children.
Mrs. Smith and her four children, ages 14, 12, 11, and 9, reside in Dallas County, Alabama. For several years prior to October 1, 1966, they had received aid under the AFDC program. By notice dated October 11, 1966, they were removed from the list of persons eligible to receive such aid. This action was taken by the Dallas County welfare authorities pursuant to the substitute father regulation, on the ground that a Mr. Williams came to her home on weekends and had sexual relations with her.
Three of Mrs. Smith’s children have not received parental support or care from a father since their natural father’s death in 1955. The fourth child’s father left home in 1963, and the child has not received the support or care of his father since then. All the children live in the home of their mother, and except for the substitute father regulation are eligible for aid. The family is not receiving any other type of public assistance, and has been living, since the termination of AFDC payments, on Mrs. Smith’s salary of between $16 and $20 per week which she earns working from 3:30 a. m. to 12 noon as a cook and waitress.
Mr. Williams, the alleged “substitute father” of Mrs. Smith’s children, has nine children of his own and lives with his wife and family, all of whom are dependent upon him for support. Mr. Williams is not the father of any of Mrs. Smith’s children. He is not legally obligated, under Alabama law, to support any of Mrs. Smith’s [316] children.10 Further, he is not willing or able to support the Smith children, and does not in fact support them. His wife is required to work to help support the Williams household.
II.
The AFDC program is based on a scheme of cooperative federalism. See generally Advisory Commission Report, supra, at 1-59. It is financed largely by the Federal Government, on a matching fund basis, and is administered by the States. States are not required to participate in the program, but those which desire to take advantage of the substantial federal funds available for distribution to needy children are required to submit an AFDC plan for the approval of the Secretary of Health, Education, and Welfare (HEW). 49 Stat. 627, [317] 42 U. S. C. §§ 601, 602, 603, and 604. See Advisory-Commission Report, supra, at 21-23.11 The plan must conform with several requirements of the Social Security Act and with rules and regulations promulgated by HEW. 49 Stat. 627, as amended, 42 U. S. C. § 602 (1964 ed., Supp. II). See also HEW, Handbook of Public Assistance Administration, pt. IY, §§ 2200, 2300 (hereafter cited as Handbook).12
One of the statutory requirements is that “aid to families with dependent children . . . shall be furnished with reasonable promptness to all eligible individuals . . . 64 Stat. 650, as amended, 42 U. S. C. § 602 (a)(9) (1964 ed., Supp. II). As noted above, § 406 (a) of the Act defines a “dependent child” as one who has been deprived of “parental” support or care by reason of the death, continued absence, or incapacity of a “parent.” 42 U. S. C. § 606 (a) (1964 ed., Supp. II). In combination, these two provisions of the Act clearly require participating States to furnish aid to families with children who have a parent absent from the home, if such families are in other respects eligible. See also Handbook, pt. IV, § 2200 (b)(4).
The State argues that its substitute father regulation simply defines who is a nonabsent “parent” under [318] § 406 (a) of the Social Security Act. 42 U. S. C. § 606 (a) (1964 ed., Supp. II). The State submits that the regulation is a legitimate way of allocating its limited resources available for AFDC assistance, in that it reduces the caseload of its social workers and provides increased benefits to those still eligible for assistance. Two state interests are asserted in support of the allocation of AFDC assistance achieved by the regulation: first, it discourages illicit sexual relationships and illegitimate births; second, it puts families in which there is an informal “marital” relationship on a par with those in which there is an ordinary marital relationship, because families of the latter sort are not eligible for AFDC assistance.13
We think it well to note at the outset what is not involved in this case. There is no question that States have considerable latitude in allocating their AFDC resources, since each State is free to set its own standard of need14 and to determine the level of benefits by the [319] amount of funds it devotes to the program.15 See Advisory Commission Report, supra, at 30-59. Further, there is no question that regular and actual contributions to a needy child, including contributions from the kind of person Alabama calls a substitute father, can be taken into account in determining whether the child is needy.16 In other words, if by reason of such a man’s contribution, [320] the child is not in financial need, the child would be ineligible for AFDC assistance without regard to the substitute father rule. The appellees here, however, meet Alabama’s need requirements; their alleged substitute father makes no contribution to their support; and they have been denied assistance solely on the basis of the substitute father regulation. Further, the regulation itself is unrelated to need, because the actual financial situation of the family is irrelevant in determining the existence of a substitute father.
Also not involved in this case is the question of Alabama’s general power to deal with conduct it regards as immoral and with the problem of illegitimacy. This appeal raises only the question whether the State may deal with these problems in the manner that it has here— by flatly denying AFDC assistance to otherwise eligible dependent children.
Alabama’s argument based on its interests in discouraging immorality and illegitimacy would have been quite relevant at one time in the history of the AFDC program. However, subsequent developments clearly establish that these state interests are not presently legitimate justifications for AFDC disqualification. Insofar as this or any similar regulation is based on the State’s asserted interest in discouraging illicit sexual behavior and illegitimacy, it plainly conflicts with federal law and policy.
A significant characteristic of public welfare programs during the last half of the 19th century in this country was their preference for the “worthy” poor. Some poor persons were thought worthy of public assistance, and others were thought unworthy because of their supposed incapacity for “moral regeneration.” H. Leyendecker, Problems and Policy in Public Assistance 45-57 (1955); Wedemeyer & Moore, The American Welfare System, 54 Calif. L. Rev. 326, 327-328 (1966). This worthy-person concept characterized the mothers’ pension wel[321] fare programs,17 which were the precursors of AFDC. See W. Bell, Aid to Dependent Children 3-19 (1965). Benefits under the mothers’ pension programs, accordingly, were customarily restricted to widows who were considered morally fit. See Bell, supra, at 7; Leyendecker, supra, at 53.
In this social context it is not surprising that both the House and Senate Committee Reports on the Social Security Act of 1935 indicate that States participating in AFDC were free to impose eligibility requirements relating to the “moral character” of applicants. H. R. Rep. No. 615, 74th Cong., 1st Sess., 24 (1935); S. Rep. No. 628, 74th Cong., 1st Sess., 36 (1935). See also 79 Cong. Rec. 5679 (statement by Representative Jenkins) (1935). During the following years, many state AFDC plans included provisions making ineligible for assistance dependent children not living in “suitable homes.” See Bell, supra, at 29-136 (1965). As applied, these suitable home provisions frequently disqualified children on the basis of the alleged immoral behavior of their mothers. Ibid.18
In the 1940’s, suitable home provisions came under increasing attack. Critics argued, for example, that such disqualification provisions undermined a mother’s confidence and authority, thereby promoting continued dependency; that they forced destitute mothers into increased immorality as a means of earning money; that they were habitually used to disguise systematic racial [322] discrimination; and that they senselessly punished impoverished children on the basis of their mothers’ behavior, while inconsistently permitting them to remain in the allegedly unsuitable homes. In 1945, the predecessor of HEW produced a state letter arguing against suitable home provisions and recommending their abolition. See Bell, supra, at 51. Although 15 States abolished their provisions during the following decade, numerous other States retained them. Ibid.
In the 1950’s, matters became further complicated by pressures in numerous States to disqualify illegitimate children from AFDC assistance. Attempts were made in at least 18 States to enact laws excluding children on the basis of their own or their siblings’ birth status. See Bell, supra, at 72-73. All but three attempts failed to pass the state legislatures, and two of the three successful bills were vetoed by the governors of the States involved. Ibid. In 1960, the federal agency strongly disapproved of illegitimacy disqualifications. See Bell, supra, at 73-74.
Nonetheless, in 1960, Louisiana enacted legislation requiring, as a condition precedent for AFDC eligibility, that the home of a dependent child be “suitable,” and specifying that any home in which an illegitimate child had been born subsequent to the receipt of public assistance would be considered unsuitable. Louisiana Acts, No. 251 (1960). In the summer of 1960, approximately 23,000 children were dropped from Louisiana’s AFDC rolls. Bell, supra, at 137. In disapproving this legislation, then Secretary of Health, Education, and Welfare Flemming issued what is now known as the Flemming Ruling, stating that as of July 1, 1961,
“A State plan . . . may not impose an eligibility condition that would deny assistance with respect to a needy child on the basis that the home conditions [323] in which the child lives are unsuitable, while the child continues to reside in the home. Assistance will therefore be continued during the time efforts are being made either to improve the home conditions or to make arrangements for the child elsewhere.” 19
Congress quickly approved the Flemming Ruling, while extending until September 1, 1962, the time for state compliance. 75 Stat. 77, as amended 42 U. S. C. § 604 (b).20 At the same time, Congress acted to implement the ruling by providing, on a temporary basis, that dependent children could receive AFDC assistance if they were placed in foster homes after a court determination that their former homes were, as the Senate Report stated, “unsuitable because of the immoral or negligent behavior of the parent.” S. Rep. No. 165, [324]*32487th Cong., 1st Sess., 6 (1961). See 75 Stat. 76, as amended, 42 U. S. C. § 608.21
In 1962, Congress made permanent the provision for AFDC assistance to children placed in foster homes and extended such coverage to include children placed in child-care institutions. 76 Stat. 180, 185, 193, 196, 207, 42 U. S. C. § 608. See S. Rep! No. 1589, 87th Cong., 2d Sess., 13 (1962). At the same time, Congress modified the Flemming Ruling by amending § 404 (b) of the Act. As amended, the statute permits States to disqualify from AFDC aid children who live in unsuitable homes, provided they are granted other “adequate care and assistance.” 76 Stat. 189, 42 U. S. C. § 604 (b). See S. Rep. No. 1589, 87th Cong., 2d Sess., 14 (1962).
Thus, under the 1961 and 1962 amendments to the Social Security Act, the States are permitted to remove a child from a home that is judicially determined to be so unsuitable as to “be contrary to the welfare of such child.” 42 U. S. C. § 608 (a)(1). The States are also permitted to terminate AFDC assistance to a child living in an unsuitable home, if they provide other adequate care and assistance for the child under a general welfare program. 42 U. S. C. § 604 (b). See S. Rep. No. 1589, 87th Cong., 2d Sess., 14 (1962). The statutory approval of the Flemming Ruling, however, precludes the States from otherwise denying AFDC assistance to dependent children on the basis of their mothers’ alleged immorality or to discourage illegitimate births.
The most recent congressional amendments to the Social Security Act further corroborate that federal public welfare policy now rests on a basis considerably more [325] sophisticated and enlightened than the “worthy-person” concept of earlier times. State plans are now required to provide for a rehabilitative program of improving and correcting unsuitable homes, §402 (a), as amended by § 201 (a)(1)(B), 81 Stat. 877, 42 U. S. C. § 602 (a) (14) (1964 ed., Supp. Ill); §406, as amended by §201 (f), 81 Stat. 880, 42 U. S. C. § 606 (1964 ed., Supp. Ill) ; to provide voluntary family planning services for the purpose of reducing illegitimate births, § 402 (a), as amended by § 201 (a)(1)(C), 81 Stat. 878, 42 U. S. C. § 602 (a) (15) (1964 ed., Supp. Ill); and to provide a program for establishing the paternity of illegitimate children and securing support for them, § 402 (a), as amended by § 201 (a)(1)(C), 81 Stat. 878, 42 U. S. C. § 602 (a) (17) (1964 ed., Supp. III).
In sum, Congress has determined that immorality and illegitimacy should be dealt with through rehabilitative measures rather than measures that punish dependent children, and that protection of such children is the paramount goal of AFDC.22 In light of the Flemming [326] Ruling and the 1961, 1962, and 1968 amendments to the Social Security Act, it is simply inconceivable, as HEW has recognized,23 that Alabama is free to discourage immorality and illegitimacy by the device of absolute disqualification of needy children. Alabama may deal with these problems by several different methods under the [327] Social Security Act. But the method it has chosen plainly conflicts with the Act.
III.
Alabama's second justification for its substitute father regulation is that “there is a public interest in a State not undertaking the payment of these funds to families who because of their living arrangements would be in the same situation as if the parents were married, except for the marriage.” In other words, the State argues that since in Alabama the needy children of married couples are not eligible for AFDC aid so long as their father is in the home, it is only fair that children of a mother who cohabits with a man not her husband and not their father be treated similarly. The difficulty with this argument is that it fails to take account of the circumstance that children of fathers living in the home are in a very different position from children of mothers who cohabit with men not their fathers: the child's father has a legal duty to support him, while the unrelated substitute father, at least in Alabama, does not. We believe Congress intended the term’“parent” in § 406 (a) of the Act, 42 U. S. C. § 606 (a), to include only those persons with a legal duty of support.
The Social Security Act of 1935 was part of a broad legislative program to counteract the depression. Congress was deeply concerned with the dire straits in which all needy children in the Nation then found themselves.24 In agreement with the President’s Committee on Eco[328] nomic Security, the House Committee Report declared, “the core of any social plan must be the child.” H. R. Rep. No. 615, 74th Cong., 1st Sess., 10 (1935). The AFDC program, however, was not designed to aid all needy children. The plight of most children was caused simply by the unemployment of their fathers. With respect to these children, Congress planned that “the work relief program and . . . the revival of private industry” would provide employment for their fathers. S. Rep. No. 628, 74th Cong., 1st Sess., 17 (1935). As the Senate Committee Report stated: “Many of the children included in relief families present no other problem than that of providing work for the breadwinner of the family.” Ibid. Implicit in this statement is the assumption that children would in fact be supported by the family “breadwinner.”
The AFDC program was designed to meet a need unmet by programs providing employment for breadwinners. It was designed to protect what the House Report characterized as “[o]ne clearly distinguishable group of children.” H. R. Rep. No. 615, 74th Cong., 1st Sess., 10 (1935). This group was composed of children in families without a “breadwinner,” “wage earner,” or “father,” as the repeated use of these terms throughout the Report of the President’s Committee,25 Committee Hearings26 and Reports27 and the floor debates 28 makes perfectly clear. To describe the sort of breadwinner that it had in mind, Congress employed the word [329] “parent.” 49 Stat. 629, as amended, 42 U. S. C. § 606 (a). A child would be eligible for assistance if his parent was deceased, incapacitated or continually absent.
The question for decision here is whether Congress could have intended that a man was to be regarded as a child’s parent so as to deprive the child of AFDC eligibility despite the circumstances: (1) that the man did not in fact- support the child; and (2) that he was not legally obligated to support the child. The State correctly observes that the fact that the man in question does not actually support the child cannot be determinative, because a natural father at home may fail actually to support his child but his presence will still render the child ineligible for assistance. On the question whether the man must be legally obligated to provide support before he can be regarded as the child’s parent, the State has no such cogent answer. We think the answer is quite clear: Congress must have meant by the term “parent” an individual who owed to the child a state-imposed legal duty of support.
It is clear, as we have noted, that Congress expected “breadwinners” who secured employment would support their children. This congressional expectation is most reasonably explained on the basis that the kind of breadwinner Congress had in mind was one who was legally obligated to support his children. We- think it beyond reason to believe that Congress would have considered that providing employment for the paramour of a deserted mother would benefit the mother’s children whom he was not obligated to support.
By a parity of reasoning, we think that Congress must have intended that the children in such a situation remain eligible for AFDC assistance notwithstanding their mother’s impropriety. AFDC was intended to provide economic security for children whom Congress could not reasonably expect would be provided for by simply secur[330] ing employment for family breadwinners.29 We think it apparent that neither Congress nor any reasonable person would believe that providing employment for some man who is under no legal duty to support a child would in any way provide meaningful economic security for that child.
A contrary view would require us to assume that Congress, at the same time that it intended to provide programs for the economic security and protection of all children, also intended arbitrarily to leave one class of destitute children entirely without meaningful protection. Children who are told, as Alabama has told these appel-lees, to look for their food to a man who is not in the least obliged to support them are without meaningful protection. Such an interpretation of congressional intent would be most unreasonable, and we decline to adopt it.
Our interpretation of the term “parent” in § 406 (a) is strongly supported by the way the term is used in other sections of the Act. Section 402 (a) (10) requires that, effective July 1, 1952, a state plan must:
“provide for prompt notice to appropriate law-enforcement officials of the furnishing of aid to families with dependent children in respect of a child who has been deserted or abandoned by a parent.” 64 Stat. 550, 42 U. S. C. § 602 (a) (10). (Emphasis added.)
The “parent” whom this provision requires to be reported to law enforcement officials is surely the same “parent” whose desertion makes a child eligible for AFDC [331] assistance in the first place. And Congress obviously did not intend that a so-called “parent” who has no legal duties of support be referred to law enforcement officials (as Alabama’s own welfare regulations recognize),30 for the very purpose of such referrals is to institute nonsupport proceedings. See Handbook, pt. IV, §§ 8100-8149.31 Whatever doubt there might have been over this proposition has been completely dispelled by the 1968 amendments to the Social Security Act, which provide that the States must develop a program:
“(i) in the case of a child born out of wedlock who is receiving aid to families with dependent children, to establish the paternity of such child and secure support for him, and
“(ii) in the case of any child receiving such aid who has been deserted or abandoned by his parent, to secure support for such child from such parent (or from any other person legally liable for such support) . . . .” § 402 (a), as amended by § 201 (a) (1)(C), 81 Stat. 878, 42 U. S. C. § 602 (a)(17) (1964 ed., Supp. III). (Emphasis added.)
[332] Another provision in the 1968 amendments requires the States, effective January 1, 1969, to report to HEW any “parent . . . against whom an order for the support and maintenance of such [dependent] child or children has been issued by” a court, if such parent is not making the required support payments. §402 (a), as amended by §211 (a), 81 Stat. 896, 42 U. S. C. § 602 (a) (21) (1964 ed., Supp. III). (Emphasis added.) Still another amendment requires the States to cooperate with HEW in locating any parent against whom a support petition has been filed in another State, and in securing compliance with any support order issued by another State, § 402 (a), as amended by § 211 (a), 81 Stat. 897, 42 U. S. C. § 602 (a) (22) (1964 ed., Supp. III).
The pattern of this legislation could not be clearer. Every effort is to be made to locate and secure support payments from persons legally obligated to support a deserted child.32 The underlying policy and consistency in statutory interpretation dictate that the “parent” referred to in these statutory provisions is the same parent as that in § 406 (a). The provisions seek to secure parental support in lieu of AFDC support for dependent children. Such parental support can be secured only where the parent is under a state-imposed legal duty to support the child. Children with alleged substitute parents who owe them no duty of support are entirely unprotected by these provisions. We think that these provisions corroborate the intent of Congress that the only kind of “parent,” under § 406 (a), whose presence in the home would provide adequate economic protection for a dependent child is one who is legally obligated to support him. Consequently, if Alabama believes it [333] necessary that it be able to disqualify a child on the basis of a man who is not under such a duty of support, its arguments should be addressed to Congress and not this Court.33
IV.
Alabama’s substitute father regulation, as written and as applied in this case, requires the disqualification of otherwise eligible dependent children if their mother “cohabits” with a man who is not obligated by Alabama law to support the children. The regulation is therefore invalid because it defines “parent” in a manner that is inconsistent with § 406 (a) of the Social Security Act. 42 U. S. C. § 606 (a).34 In denying AFDC assistance to appellees on the basis of this invalid regulation, Alabama has breached its federally imposed obligation to furnish “aid to families with dependent children . . . with reasonable promptness to all eligible individuals . . . .” 42 U. S. C. § 602 (a)(9) (1964 ed., Supp. II). Our conclusion makes unnecessary consideration of appellees’ equal-protection claim, upon which we intimate no views.
We think it well, in concluding, to emphasize that no legitimate interest of the State of Alabama is defeated [334] by the decision we announce today. The State's interest in discouraging illicit sexual behavior and illegitimacy may be protected by other means, subject to constitutional limitations, including state participation in AFDC rehabilitative programs. Its interest in economically allocating its limited AFDC resources may be protected by its undisputed power to set the level of benefits and the standard of need, and by its taking into account in determining whether a child is needy all actual and regular contributions to his support.
All responsible governmental agencies in the Nation today recognize the enormity and pervasiveness of social ills caused by poverty. The causes of and cures for poverty are currently the subject of much debate. We hold today only that Congress has made at least this one determination: that destitute children who are legally fatherless cannot be flatly denied federally funded assistance on the transparent fiction that they have a substitute father.
Affirmed.