Quinn-Brintnall, J.
— A.T. is a two-and-a-half-year old girl who was exposed to cocaine in útero. The trial court terminated her mother’s parental rights by default when she failed to appear at the termination hearing. A.T.’s father, M.C., was in prison when the baby was bom. After he realized he might be the father, he had himself tested and established paternity. Because of a prior rape convic[712]*712tion, the trial court found aggravated circumstances existed under former RCW 13.34.130 (1998)1 such that reasonable efforts to reunify A. T. and M.C. were not required. The court summarily concluded that all six factors for termination of parental rights were proven by clear and cogent evidence and it terminated M.C.’s parental rights.
We hold that the court incorrectly used the prior rape conviction to find “aggravated circumstances” under former RCW 13.34.130 in this case. Thus, the court’s conclusion that all requirements for termination of parental rights had been met is also in error. We vacate the court’s order terminating M.C.’s parental rights and remand for further proceedings consistent with this opinion.
FACTS
A.T. was born precipitously at home on February 13, 1999. Her mother, M.T., brought her to Tacoma General Hospital where she delivered the placenta and then left against medical advice. The Tacoma Police Department took the baby into protective custody that day. According to the dependency petition, M.T. had had no prenatal care and had used crack cocaine throughout her pregnancy. The baby tested positive for cocaine the day after her birth.
M.T.’s parental rights to this baby were terminated by default when she failed to appear at the dependency hearing.2 M.T. is not the subject of this appeal.
After the birth, M.T. indicated that M.C. might be the father of A.T. At the time of birth, he was in prison for unlawful possession of methamphetamine. M.C. was not married to M.T.
At the time dependency was entered, M.C. had not established paternity. A review hearing was held on June [713]*71328, 1999, which noted that services would be provided to M.C. once he was proven to be A.T.’s father.3 In preparation, M.C. took medical first aid, drug and alcohol treatment, and anger management classes while in prison. He sent letters to the Child Protective Services (CPS) worker and the Assistant Attorney General stating that he wanted to parent the child. In the interim, while he was finishing his sentence, he wanted CPS to place the baby with his wife, A.C.4 CPS refused the placement request because M.C.’s wife was not a relative of the baby.
After paternity was established, the Department of Social and Health Services (DSHS) told M.C. that it would make reasonable efforts to reunify him and the baby. Subsequently, DSHS learned that M.C. had a 1987 sex offense (third degree rape) and that he failed to register as a sex offender in 1997. On October 21, 1999, DSHS requested that the trial court amend the review hearing order to classify this as an aggravated circumstance case under RCW 13.34.130(2). The court made that finding and discharged DSHS’ duty to provide reasonable efforts to reunify A.T. with her father.
M.C. moved for the court to reconsider its decision on November 1, 1999, but the court denied the motion. The trial court terminated M.C.’s parental rights on January 19, 2000. M.C. timely appealed the termination order to this court.
ANALYSIS
Finding of Aggravated Circumstances
M.C. challenges the trial court’s determination that aggravated circumstances exist such that DSHS was relieved [714]*714of its duty to provide services to reunify him with his daughter. The resolution of this issue requires an examination of the plain language of the statute, RCW 13.34.130(2)(x), as well as its legislative history. The statute states in pertinent part: “Conviction of the parent of a sex offense under chapter 9A.44 RCW or incest under RCW 9A.64.020 when the child is born of the offense.”
Construction of a statute is a question of law that we review de novo. City of Pasco v. Pub. Employment Relations Comm’n, 119 Wn.2d 504, 507, 833 P.2d 381 (1992). The courts retain the ultimate authority to interpret a statute. Franklin County Sheriff’s Office v. Sellers, 97 Wn.2d 317, 325-26, 646 P.2d 113 (1982), cert, denied, 459 U.S. 1106 (1983). The reviewing court’s obligation is to give effect to the Legislature’s intent. Review begins with the plain language of the statute. Lacey Nursing Ctr., Inc. v. Dep’t of Revenue, 128 Wn.2d 40, 53, 905 P.2d 338 (1995).
Where no contrary intention appears in a statute, relative and qualifying words and phrases, both grammatically and legally, refer to the last antecedent. Boeing Co. v. Dep’t of Licensing, 103 Wn.2d 581, 587, 693 P.2d 104 (1985); Fraternal Order of Eagles, Tenino Aerie No. 564 v. Grand Aerie, Fraternal Order of Eagles, 108 Wn. App. 208, 216, 27 P.3d 1254, 1258 (2001). “ ‘Generally, a comma should precede a conjunction connecting two coordinate clauses or phrases in a statute in order to prevent the following qualifying phrases from modifying the clause preceding the conjunction.’ ” In re Pers. Restraint of Mahrle, 88 Wn. App. 410, 414, 945 P.2d 1142 (1997) (quoting Ludwig v. State, 931 S.W.2d 239, 242 (Tex. Crim. App. 1996)).
Where a statute is susceptible to more than one meaning, it is ambiguous. When a statute is ambiguous, this court attempts to determine the Legislature’s intent. In re Sehome Park Care Ctr., Inc., 127 Wn.2d 774, 778, 903 P.2d 443 (1995). A clarifying amendment may be applied retroactively so long as the amendment does not contravene [715]*715previous court decisions construing the original statute. In re Dependency of Ramquist, 52 Wn. App. 854, 859, 765 P.2d 30 (1988) (citing State v. Jones, 110 Wn.2d 74, 82, 750 P.2d 620 (1988)).
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Quinn-Brintnall, J.
— A.T. is a two-and-a-half-year old girl who was exposed to cocaine in útero. The trial court terminated her mother’s parental rights by default when she failed to appear at the termination hearing. A.T.’s father, M.C., was in prison when the baby was bom. After he realized he might be the father, he had himself tested and established paternity. Because of a prior rape convic[712]*712tion, the trial court found aggravated circumstances existed under former RCW 13.34.130 (1998)1 such that reasonable efforts to reunify A. T. and M.C. were not required. The court summarily concluded that all six factors for termination of parental rights were proven by clear and cogent evidence and it terminated M.C.’s parental rights.
We hold that the court incorrectly used the prior rape conviction to find “aggravated circumstances” under former RCW 13.34.130 in this case. Thus, the court’s conclusion that all requirements for termination of parental rights had been met is also in error. We vacate the court’s order terminating M.C.’s parental rights and remand for further proceedings consistent with this opinion.
FACTS
A.T. was born precipitously at home on February 13, 1999. Her mother, M.T., brought her to Tacoma General Hospital where she delivered the placenta and then left against medical advice. The Tacoma Police Department took the baby into protective custody that day. According to the dependency petition, M.T. had had no prenatal care and had used crack cocaine throughout her pregnancy. The baby tested positive for cocaine the day after her birth.
M.T.’s parental rights to this baby were terminated by default when she failed to appear at the dependency hearing.2 M.T. is not the subject of this appeal.
After the birth, M.T. indicated that M.C. might be the father of A.T. At the time of birth, he was in prison for unlawful possession of methamphetamine. M.C. was not married to M.T.
At the time dependency was entered, M.C. had not established paternity. A review hearing was held on June [713]*71328, 1999, which noted that services would be provided to M.C. once he was proven to be A.T.’s father.3 In preparation, M.C. took medical first aid, drug and alcohol treatment, and anger management classes while in prison. He sent letters to the Child Protective Services (CPS) worker and the Assistant Attorney General stating that he wanted to parent the child. In the interim, while he was finishing his sentence, he wanted CPS to place the baby with his wife, A.C.4 CPS refused the placement request because M.C.’s wife was not a relative of the baby.
After paternity was established, the Department of Social and Health Services (DSHS) told M.C. that it would make reasonable efforts to reunify him and the baby. Subsequently, DSHS learned that M.C. had a 1987 sex offense (third degree rape) and that he failed to register as a sex offender in 1997. On October 21, 1999, DSHS requested that the trial court amend the review hearing order to classify this as an aggravated circumstance case under RCW 13.34.130(2). The court made that finding and discharged DSHS’ duty to provide reasonable efforts to reunify A.T. with her father.
M.C. moved for the court to reconsider its decision on November 1, 1999, but the court denied the motion. The trial court terminated M.C.’s parental rights on January 19, 2000. M.C. timely appealed the termination order to this court.
ANALYSIS
Finding of Aggravated Circumstances
M.C. challenges the trial court’s determination that aggravated circumstances exist such that DSHS was relieved [714]*714of its duty to provide services to reunify him with his daughter. The resolution of this issue requires an examination of the plain language of the statute, RCW 13.34.130(2)(x), as well as its legislative history. The statute states in pertinent part: “Conviction of the parent of a sex offense under chapter 9A.44 RCW or incest under RCW 9A.64.020 when the child is born of the offense.”
Construction of a statute is a question of law that we review de novo. City of Pasco v. Pub. Employment Relations Comm’n, 119 Wn.2d 504, 507, 833 P.2d 381 (1992). The courts retain the ultimate authority to interpret a statute. Franklin County Sheriff’s Office v. Sellers, 97 Wn.2d 317, 325-26, 646 P.2d 113 (1982), cert, denied, 459 U.S. 1106 (1983). The reviewing court’s obligation is to give effect to the Legislature’s intent. Review begins with the plain language of the statute. Lacey Nursing Ctr., Inc. v. Dep’t of Revenue, 128 Wn.2d 40, 53, 905 P.2d 338 (1995).
Where no contrary intention appears in a statute, relative and qualifying words and phrases, both grammatically and legally, refer to the last antecedent. Boeing Co. v. Dep’t of Licensing, 103 Wn.2d 581, 587, 693 P.2d 104 (1985); Fraternal Order of Eagles, Tenino Aerie No. 564 v. Grand Aerie, Fraternal Order of Eagles, 108 Wn. App. 208, 216, 27 P.3d 1254, 1258 (2001). “ ‘Generally, a comma should precede a conjunction connecting two coordinate clauses or phrases in a statute in order to prevent the following qualifying phrases from modifying the clause preceding the conjunction.’ ” In re Pers. Restraint of Mahrle, 88 Wn. App. 410, 414, 945 P.2d 1142 (1997) (quoting Ludwig v. State, 931 S.W.2d 239, 242 (Tex. Crim. App. 1996)).
Where a statute is susceptible to more than one meaning, it is ambiguous. When a statute is ambiguous, this court attempts to determine the Legislature’s intent. In re Sehome Park Care Ctr., Inc., 127 Wn.2d 774, 778, 903 P.2d 443 (1995). A clarifying amendment may be applied retroactively so long as the amendment does not contravene [715]*715previous court decisions construing the original statute. In re Dependency of Ramquist, 52 Wn. App. 854, 859, 765 P.2d 30 (1988) (citing State v. Jones, 110 Wn.2d 74, 82, 750 P.2d 620 (1988)).
At the time of trial, RCW 13.34.130 allowed for expedited termination of parental rights without requiring reasonable efforts to reunify the family if certain aggravated circumstances were found.5 Specifically, the parties argued over the meaning of subsection (x), “Conviction of the parent of a sex offense under chapter 9A.44 RCW or incest under RCW 9A.64.020 when the child is born of the offense.” RCW 13.34.130(2)(x). M.C. argued that the phrase “when the child is born of the offense” modified both “sex offense” and “incest.” Thus, his rape conviction from 14 years ago would not qualify as an aggravated circumstance.6 DSHS argued that the statute was ambiguous but still applied to M.C.
M.C. claimed that because all but one of the other nine factors refer to acts by the parent against the child that is the subject of the dependency or termination action or other family member, the Legislature intended to include only offenses that occur within the family or against this child, not all offenses by parents. He also claimed that interpreting RCW 13.34.130(2)(x) more broadly would contradict factor (i), conviction of the parent of rape of the child in the first, second, or third degree: “The only logical way to harmonize sections (i) and (x) is to find that a sexual assault conviction is an aggravated circumstance □ only where the child is the victim, under section (i) or the child is born of the offense, under section (x).” Br. of Appellant at 19.
Respondent DSHS initially argued that the “last antecedent rule” required the statute be read so that the modifier “born of the offense” applied to only “incest.” Following this construction, M.C.’s prior sex offense is an aggravated [716]*716circumstance under subsection (x). However, the agency later argued that the Legislature’s subsequent amendment to the statute (placing the “born of the offense” clause before “sex offense” and “incest”) resolved any ambiguity.7 We agree that the amendment resolved the ambiguity — in favor of the appellant, M.C. DSHS’ argument concedes the appellant’s statutory construction claim.8
Even amended, the statute may be read plausibly either way and is therefore ambiguous. This court, in construing subsection (x), may look to the construction of the other subsections to determine the legislative intent. Subsections (i) through (v) are all composed the same way. They refer to convictions of the parent for several crimes concerning “the child” who is the subject of the dependency. RCW 13.34.130(2)(i)-(v).9 To interpret subsection (x) consistently, it should likewise be read as one in a list of crimes directly concerning the child in the dependency action. Otherwise, a punctuation mark separating the antecedent clause or more specific language would be required to deviate from the pattern. See 2A Norman J. Singer, Statutes and Statutory Construction § 47.15 (6th ed. 2000) (when punctuation conveys a clear meaning, the courts should give weight to it as evidence).
Because RCW 13.34.130(2)(x) may be read two ways, this court examines the legislative history to resolve the ambiguity. When a statute is ambiguous, this court resorts to legislative history and other aids for construction. Cockle v. Dep’t of Labor & Indus., 142 Wn.2d 801, 808, 16 P.3d 583 (2001). The goal of statutory construction is to give effect to the Legislature’s intent. Kadoranian v. Bellingham Police Dep’t, 119 Wn.2d 178, 185, 829 P.2d 1061 (1992).
[717]*717The legislative history for the addition of section (x) to the aggravated circumstances factors further supports the appellant’s claim that “when the child is born of the offense” modifies both offenses — rape and incest — in the statute. On February 5 and March 2, 1999, the House Judiciary Committee added “conviction of the parent of a sex offense when the child is born of the offense to the list of factors a court must consider” in finding aggravated circumstances.10 The Senate Committee on Human Services and Corrections on April 1,1999, used similar language: “A parent’s conviction of a sex offense or incest is an aggravating factor in a dependency action concerning a child born as a result of the crime.”* 11 But, when the final bill passed on April 12, 1999, the aggravated circumstances language had been condensed to the current phrasing, “conviction of the parent of a sex offense or incest when the child is bom of the offense.”12 Thus, the ambiguity came about only in the final drafting. The Legislature always intended that the phrase “when the child is born of the offense” refer to both offenses.
Based on the plain language and legislative history of the statute, the aggravated circumstances finding the court entered below is incorrect. A finding of aggravated circumstances under subsection (x) can be made only when the sex offense results in the birth of the child that is the subject of the dependency. M.C.’s 1987 rape conviction clearly did not result in the birth of A.T. Thus, because the finding in this case was based on a misinterpretation of the statute, it must be reversed as clear error.13
[718]*718The order terminating M.C.’s parental rights is vacated and the matter is remanded to the trial court for further proceedings consistent with this opinion.
A majority of the panel having determined that only the foregoing portion of this opinion will be printed in the Washington Appellate Reports and that the remainder shall be filed for public record pursuant to RCW 2.06.040, it is so ordered.
Armstrong, C.J., and Bridgewater, J., concur.