Mr. Justice Powell
delivered the opinion of the Court.
The appellant, Abdiel Caban, challenges the constitutionality of § 111 of the New York Domestic Relations Law (Mc[382]*382Kinney 1977), under which two of his natural children were adopted by their natural mother and stepfather without his consent. We find the statute to be unconstitutional, as the distinction it invariably makes between the rights of unmarried mothers and the rights of unmarried fathers has not been shown to be substantially related to an important state interest.
I
Abdiel Caban and appellee Maria Mohammed lived together in New York City from September 1968 until the end of 1973. During this time Caban and Mohammed represented themselves as being husband and wife, although they never legally married. Indeed, until 1974 Caban was married to another woman, from whom he was separated. While living with the appellant, Mohammed gave birth to two children: David Andrew Caban, born July 16, 1969, and Denise Caban, born March 12, 1971. Abdiel Caban was identified as the father on each child’s birth certificate, and lived with the children as their father until the end of 1973. Together with Mohammed, he contributed to the support of the family.
In December 1973, Mohammed took the two children and left the appellant to take up residence with appellee Kazin Mohammed, whom she married on January 30, 1974. For the next nine months, she took David and Denise each weekend to visit her mother, Delores Gonzales, who lived one floor above Caban. Because of his friendship with Gonzales, Caban was able to see the children each week when they came to visit their grandmother.
In September 1974, Gonzales left New York to take up residence in her native Puerto Rico. At the Mohammeds’ request, the grandmother took David and Denise with her. According to appellees, they planned to join the children in Puerto Rico as soon as they had saved enough money to start a business there. During the children’s stay with their grandmother, Mrs. Mohammed kept in touch with David and [383]*383Denise by mail; Caban communicated with the children through his parents, who also resided in Puerto Rico. In November 1975, he went to Puerto Rico, where Gonzales willingly surrendered the children to Caban with the understanding that they would be returned after a few days. Caban, however, returned to New York with the children. When Mrs. Mohammed learned that the children were in Caban’s custody, she attempted to retrieve them with the aid of a police officer. After this attempt failed, the appellees instituted custody proceedings in the New York Family Court, which placed the children in the temporary custody of the Mohammeds and gave Caban and his new wife, Nina, visiting rights.
In January 1976, appellees filed a petition under § 110 of the New York Domestic Relations Law to adopt David and Denise.1 In March, the Cabans cross petitioned for adoption. After the Family Court stayed the custody suit pending the outcome of the adoption proceedings, a hearing was held on the petition and cross-petition before a Law Assistant to a New York Surrogate in Kings County, N. Y. At this hearing, both the Mohammeds and the Cabans were represented by counsel and were permitted to present and cross-examine witnesses.
The Surrogate granted the Mohammeds’ petition to adopt the children, thereby cutting off all of appellant’s parental [384]*384rights and obligations.2 In his opinion, the Surrogate noted the limited right under New York law of unwed fathers in adoption proceedings: “Although a putative father’s consent to such an adoption is not a legal necessity, he is entitled to an opportunity to be heard in opposition to the proposed stepfather adoption.” Moreover, the court stated that the appellant was foreclosed from adopting David and Denise, as the natural mother had withheld her consent. Thus, the court considered the evidence presented by the Cabans only insofar as it reflected upon the Mohammeds’ qualifications as prospective parents. The Surrogate found them well qualified and granted their adoption petition.
The New York Supreme Court, Appellate Division, affirmed. It stated that appellant’s constitutional challenge to § 111 was foreclosed by the New York Court of Appeals’ decision in In re Malpica-Orsini, 36 N. Y. 2d 568, 331 N. E. 2d 486 (1975), appeal dism’d for want of substantial federal question sub nom. Orsini v. Blasi, 423 U. S. 1042 (1976). In re David Andrew C., 56 App. Div. 2d 627, 391 N. Y. S. 2d 846 (1977). The New York Court of Appeals dismissed the appeal in a [385]*385memorandum decision based on In re Malpica-Orsini, supra. In re David A. C., 43 N. Y. 2d 708, 372 N. E. 2d 42 (1977).
On appeal to this Court, appellant presses two claims. First, he argues that the distinction drawn under New York law between the adoption rights of an unwed father and those of other parents violates the Equal Protection Clause of the Fourteenth Amendment. Second, appellant contends that this Court’s decision in Quilloin v. Walcott, 434 U. S. 246 (1978), recognized the due process right of natural fathers to maintain a parental relationship with their children absent a finding that they are unfit as parents.3
II
Section 111 of the N. Y. Dom. Rel. Law (McKinney 1977) provides in part that
“consent to adoption shall be required as follows: . . . (b) Of the parents or surviving parent, whether adult or infant, of a child born in wedlock; [and] (c) Of the mother, whether adult or infant, of a child bom out of wedlock. . .
The statute makes parental consent unnecessary, however, in certain cases, including those where the parent has abandoned or relinquished his of her rights in the child or has been adjudicated incompetent to care for the child.4 Absent one of [386]*386these circumstances, an unwed mother has the authority under New York law to block the adoption of her child simply by withholding consent. The unwed father has no similar control [387]*387over the fate of his child, even when his parental relationship is substantial — as in this case. He may prevent the termination of his parental rights only by showing that the best interests of the child would not permit the child’s adoption by the petitioning couple.
Despite the plain wording of the statute, appellees argue that unwed fathers are not treated differently under § 111 from other parents. According to appellees, the consent requirement of § 111 is merely a formal requirement, lacking in substance, as New York courts find consent to be unnecessary whenever the best interests of the child support the adoption. Because the best interests of the child always determine whether an adoption petition is granted in New York, appellees contend that all parents, including unwed fathers, are subject to the same standard.
Appellees’ interpretation of § 111 finds no support in New York case law. On the contrary, the New York Court of Appeals has stated unequivocally that the question whether consent is required is entirely separate from that of the best interests of the child.5 Indeed, the Surrogate’s decision in the present case, affirmed by the New York Court of Appeals, was [388]
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Mr. Justice Powell
delivered the opinion of the Court.
The appellant, Abdiel Caban, challenges the constitutionality of § 111 of the New York Domestic Relations Law (Mc[382]*382Kinney 1977), under which two of his natural children were adopted by their natural mother and stepfather without his consent. We find the statute to be unconstitutional, as the distinction it invariably makes between the rights of unmarried mothers and the rights of unmarried fathers has not been shown to be substantially related to an important state interest.
I
Abdiel Caban and appellee Maria Mohammed lived together in New York City from September 1968 until the end of 1973. During this time Caban and Mohammed represented themselves as being husband and wife, although they never legally married. Indeed, until 1974 Caban was married to another woman, from whom he was separated. While living with the appellant, Mohammed gave birth to two children: David Andrew Caban, born July 16, 1969, and Denise Caban, born March 12, 1971. Abdiel Caban was identified as the father on each child’s birth certificate, and lived with the children as their father until the end of 1973. Together with Mohammed, he contributed to the support of the family.
In December 1973, Mohammed took the two children and left the appellant to take up residence with appellee Kazin Mohammed, whom she married on January 30, 1974. For the next nine months, she took David and Denise each weekend to visit her mother, Delores Gonzales, who lived one floor above Caban. Because of his friendship with Gonzales, Caban was able to see the children each week when they came to visit their grandmother.
In September 1974, Gonzales left New York to take up residence in her native Puerto Rico. At the Mohammeds’ request, the grandmother took David and Denise with her. According to appellees, they planned to join the children in Puerto Rico as soon as they had saved enough money to start a business there. During the children’s stay with their grandmother, Mrs. Mohammed kept in touch with David and [383]*383Denise by mail; Caban communicated with the children through his parents, who also resided in Puerto Rico. In November 1975, he went to Puerto Rico, where Gonzales willingly surrendered the children to Caban with the understanding that they would be returned after a few days. Caban, however, returned to New York with the children. When Mrs. Mohammed learned that the children were in Caban’s custody, she attempted to retrieve them with the aid of a police officer. After this attempt failed, the appellees instituted custody proceedings in the New York Family Court, which placed the children in the temporary custody of the Mohammeds and gave Caban and his new wife, Nina, visiting rights.
In January 1976, appellees filed a petition under § 110 of the New York Domestic Relations Law to adopt David and Denise.1 In March, the Cabans cross petitioned for adoption. After the Family Court stayed the custody suit pending the outcome of the adoption proceedings, a hearing was held on the petition and cross-petition before a Law Assistant to a New York Surrogate in Kings County, N. Y. At this hearing, both the Mohammeds and the Cabans were represented by counsel and were permitted to present and cross-examine witnesses.
The Surrogate granted the Mohammeds’ petition to adopt the children, thereby cutting off all of appellant’s parental [384]*384rights and obligations.2 In his opinion, the Surrogate noted the limited right under New York law of unwed fathers in adoption proceedings: “Although a putative father’s consent to such an adoption is not a legal necessity, he is entitled to an opportunity to be heard in opposition to the proposed stepfather adoption.” Moreover, the court stated that the appellant was foreclosed from adopting David and Denise, as the natural mother had withheld her consent. Thus, the court considered the evidence presented by the Cabans only insofar as it reflected upon the Mohammeds’ qualifications as prospective parents. The Surrogate found them well qualified and granted their adoption petition.
The New York Supreme Court, Appellate Division, affirmed. It stated that appellant’s constitutional challenge to § 111 was foreclosed by the New York Court of Appeals’ decision in In re Malpica-Orsini, 36 N. Y. 2d 568, 331 N. E. 2d 486 (1975), appeal dism’d for want of substantial federal question sub nom. Orsini v. Blasi, 423 U. S. 1042 (1976). In re David Andrew C., 56 App. Div. 2d 627, 391 N. Y. S. 2d 846 (1977). The New York Court of Appeals dismissed the appeal in a [385]*385memorandum decision based on In re Malpica-Orsini, supra. In re David A. C., 43 N. Y. 2d 708, 372 N. E. 2d 42 (1977).
On appeal to this Court, appellant presses two claims. First, he argues that the distinction drawn under New York law between the adoption rights of an unwed father and those of other parents violates the Equal Protection Clause of the Fourteenth Amendment. Second, appellant contends that this Court’s decision in Quilloin v. Walcott, 434 U. S. 246 (1978), recognized the due process right of natural fathers to maintain a parental relationship with their children absent a finding that they are unfit as parents.3
II
Section 111 of the N. Y. Dom. Rel. Law (McKinney 1977) provides in part that
“consent to adoption shall be required as follows: . . . (b) Of the parents or surviving parent, whether adult or infant, of a child born in wedlock; [and] (c) Of the mother, whether adult or infant, of a child bom out of wedlock. . .
The statute makes parental consent unnecessary, however, in certain cases, including those where the parent has abandoned or relinquished his of her rights in the child or has been adjudicated incompetent to care for the child.4 Absent one of [386]*386these circumstances, an unwed mother has the authority under New York law to block the adoption of her child simply by withholding consent. The unwed father has no similar control [387]*387over the fate of his child, even when his parental relationship is substantial — as in this case. He may prevent the termination of his parental rights only by showing that the best interests of the child would not permit the child’s adoption by the petitioning couple.
Despite the plain wording of the statute, appellees argue that unwed fathers are not treated differently under § 111 from other parents. According to appellees, the consent requirement of § 111 is merely a formal requirement, lacking in substance, as New York courts find consent to be unnecessary whenever the best interests of the child support the adoption. Because the best interests of the child always determine whether an adoption petition is granted in New York, appellees contend that all parents, including unwed fathers, are subject to the same standard.
Appellees’ interpretation of § 111 finds no support in New York case law. On the contrary, the New York Court of Appeals has stated unequivocally that the question whether consent is required is entirely separate from that of the best interests of the child.5 Indeed, the Surrogate’s decision in the present case, affirmed by the New York Court of Appeals, was [388]*388based upon the assumption that there was a distinctive difference between the rights of Abdiel Caban, as the unwed father of David and Denise, and Maria Mohammed, as the unwed mother of the children: Adoption by Abdiel was held to be impermissible in the absence of Maria’s consent, whereas adoption by Maria could be prevented by Abdiel only if he could show that the Mohammeds’ adoption of the children would not be in the children’s best interests. Accordingly, it is clear that § 111 treats unmarried parents differently according to their sex.6
III
Gender-based distinctions “must serve important governmental objectives and must be substantially related to achievement of those objectives” in order to withstand judicial scrutiny under the Equal Protection Clause. Craig v. Boren, 429 U. S. 190, 197 (1976). See also Reed v. Reed, 404 U. S. 71 (1971). The question before us, therefore, is whether the distinction in § 111 between unmarried mothers and unmarried fathers bears a substantial relation to some important state interest. Appellees assert that the distinction is justified by a fundamental difference between maternal and paternal relations — that “a natural mother, absent special circumstances, bears a closer relationship with her child . . . than a father does.” Tr. of Oral Arg. 41.
[389]*389Contrary to appellees’ argument and to the apparent presumption underlying § 111, maternal and paternal roles are not invariably different in importance. Even if unwed mothers as a class were closer than unwed fathers to their newborn infants, this generalization concerning parent-child relations would become less acceptable as a basis for legislative distinctions as the age of the child increased. The present case demonstrates that an unwed father may have a relationship with his children fully comparable to that of the mother. Appellant Caban, appellee Maria Mohammed, and their two children lived together as a natural family for several years. As members of this family, both mother and father participated in the care and support of their children.7 There is no reason to believe that the Caban children — aged 4 and 6 at the time of the adoption proceedings — had a relationship with their mother unrivaled by the affection and concern of their father. We reject, therefore, the claim that the broad, gender-based distinction of § 111 is required by any universal difference between maternal and paternal relations at every phase of a child’s development.
As an alternative justification for § 111, appellees argue that the distinction between unwed fathers and unwed mothers is substantially related to the State’s interest in promoting the adoption of illegitimate children. Although the legislative [390]*390history of § 111 is sparse,8 in In re Malpica-Orsini, 36 N. Y. 2d 568, 331 N. E. 2d 486 (1975), the New York Court of Appeals identified as the legislature’s purpose in enacting § 111 the furthering of the interests of illegitimate children, for whom adoption often is the best course.9 The court concluded:
“To require the consent of fathers of children born out of wedlock ... , or even some of them, would have the overall effect of denying homes to the homeless and of depriving innocent children of the other blessings of adoption. The cruel and undeserved out-of-wedlock stigma would continue its visitations. At the very least, the worthy process of adoption would be severely impeded.” 36 N. Y. 2d, at 572, 331 N. E. 2d, at 489.
The court reasoned that people wishing tO' adopt a child born out of wedlock would be discouraged if the natural father could prevent the adoption by the mere withholding of his consent. Indeed, the court went so far as to suggest that “[m]arriages would be discouraged because of the reluctance of prospective husbands to involve themselves in a family sit[391]*391uation where they might only be a foster parent and could not adopt the mother's offspring.” Id., at 573, 331 N. E. 2d, at 490. Finally, the court noted that if unwed fathers’ consent were required before adoption could take place, in many instances the adoption would have to be delayed or eliminated altogether, because of the unavailability of the natural father.10
The State’s interest in providing for the well-being of illegitimate children is an important one. We do not question that the best interests of such children often may require their adoption into new families who will give them the stability of a normal, two-parent home. Moreover, adoption will remove the stigma under which illegitimate children suffer. But the unquestioned right of the State to further these desirable ends by legislation is not in itself sufficient to justify the gender-based distinction of § 111. Rather, under the relevant cases applying the Equal Protection Clause it must be shown that the distinction is structured reasonably to further these ends. As we repeated in Reed v. Reed, 404 U. S., at 76, such a statutory “classification 'must be reasonable, not arbitrary, and must rest upon some ground of difference having a fair and substantial relation to the object of the legislation, so that all persons similarly circumstanced shall be treated alike.’ Royster Guano Co. v. Virginia, 253 U. S. 412, 415 (1920).”
We find that the distinction in § 111 between unmarried mothers and unmarried fathers, as illustrated by this case, does not bear a substantial relation to the State’s interest in providing adoptive homes for its illegitimate children. It may be that, given the opportunity, some unwed fathers would prevent the adoption of their illegitimate children. This impediment to adoption usually is the result of a natural [392]*392parental interest shared by both genders alike; it is not a manifestation of any profound difference between the affection and concern of mothers and fathers for their children. Neither the State nor the appellees have argued that unwed fathers are more likely to object to the adoption of their children than are unwed mothers; nor is there any self-evident reason why as a class they would be.
The New York Court of Appeals in In re Malpica-Orsini, supra, suggested that the requiring of unmarried fathers’ consent for adoption would pose a strong impediment for adoption because often it is impossible to locate unwed fathers when adoption proceedings are brought, whereas mothers are more likely to remain with their children. Even if the special difficulties attendant upon locating and identifying unwed fathers at birth would justify a legislative distinction between mothers and fathers of newborns,11 these difficulties need not persist past infancy. When the adoption of an older child is sought, the State’s interest in proceeding with adoption cases can be protected by means that do not draw such an inflexible gender-based distinction as that made in § 111.12 In those cases where the father never has come forward to participate in the rearing of his child, nothing in the Equal Protection Clause precludes the State from withholding from him the privilege of vetoing the adoption of that child. Indeed, under the statute as it now stands the surrogate may proceed in the absence of consent when the parent whose consent otherwise would be required never has come forward or has abandoned the child.13 See, e. g., In re Orlando F., 40 N. Y. 2d 103, 351 [393]*393N. E. 2d 711 (1976). But in cases such as this, where the father has established a substantial relationship with the child and has admitted his paternity,14 a State should have no difficulty in identifying the father even of children born out of wedlock.15 Thus, no showing has been made that the different treatment afforded unmarried fathers and unmarried mothers under § 111 bears a substantial relationship to the proclaimed interest of the State in promoting the adoption of illegitimate children.
[394]*394In sum, we believe that § 111 is another example of “over-broad generalizations” in gender-based classifications. See Califano v. Goldfarb, 430 U. S. 199, 211 (1977); Stanton v. Stanton, 421 U. S. 7, 14-15.(1975). The effect of New York’s classification is to discriminate against unwed fathers even when their identity is known and they have manifested a significant paternal interest in the child. The facts of this case illustrate the harshness of classifying unwed fathers as being invariably less qualified and entitled than mothers to exercise a concerned judgment as to the fate of their children. Section 111 both excludes some loving fathers from full participation in the decision whether their children will be adopted and, at the same time, enables some alienated mothers arbitrarily to cut off the paternal rights of fathers. We conclude that this undifferentiated distinction between unwed mothers and unwed fathers, applicable in all circumstances where adoption of a child of theirs is at issue, does not bear a substantial relationship to the State’s asserted interests.16
The judgment of the New York Court of Appeals is
Reversed.