What are the facts?
Carole D. was married to Gerald D. when she engaged in an extramarital relationship with Michael H. During that period, Carole became pregnant and gave birth to a daughter, Victoria. Because Victoria was born while Carole and Gerald were married and cohabiting, California Evidence Code § 621 (as it then existed) provided a conclusive presumption that Victoria was the child of the marriage. Blood tests showed a 98.07% probability that Michael was Victoria's biological father. For a time, Carole and Victoria lived with Michael and he developed a relationship with the child; later, Carole reconciled with Gerald, returned to the marital home, and cut off Michael's access. Michael filed an action to establish paternity and secure visitation, and the child (through a guardian ad litem) also asserted interests in maintaining her relationship with Michael. California's § 621 allowed only the husband or wife (not a third party) to challenge the presumption within a limited window, and thus, under state law, Michael lacked standing to rebut the presumption. State courts rejected Michael's constitutional claims, and the U.S. Supreme Court granted review to consider whether the statute, as applied, violated the Due Process or Equal Protection Clauses.
What is the legal issue?
Does the Due Process Clause confer on a biological father who has developed a relationship with a child born into an intact marriage a fundamental liberty interest to assert paternity and parental rights in contravention of a state's conclusive marital presumption of legitimacy? Additionally, does the statute's limitation on rebuttal and standing violate Equal Protection as applied to the biological father and the child?
What rule applies?
States may establish and enforce a strong—indeed conclusive—marital presumption of legitimacy for children born to a married woman cohabiting with her husband. The Constitution does not recognize, as a fundamental liberty interest, the right of an adulterous biological father to assert parental rights that would disrupt the marital family into which the child was born. In the absence of a fundamental right, such statutes are reviewed under rational basis and will be upheld if they rationally further legitimate state interests (including family integrity, privacy of the marital unit, and avoidance of paternity litigation). A plurality framed substantive due process analysis by looking to the most specific level of historical tradition to define the asserted right; a separate concurrence declined to endorse that methodology but agreed no constitutional violation occurred on these facts.
What did the court hold?
The Court upheld California's conclusive marital presumption as applied. The biological father had no fundamental liberty interest under the Due Process Clause to establish paternity or obtain parental rights where the child was born into an intact marriage protected by the presumption, and the statute did not violate Equal Protection.
What is the reasoning?
Substantive due process. The central question was how to characterize the asserted liberty interest. The plurality reasoned that fundamental rights are those deeply rooted in the nation's history and tradition. Defined at the most specific level consistent with tradition, there is no historical protection for the parental claims of an adulterous biological father against the interests of the marital family. By longstanding common law and state policy, the child of a married woman living with her husband is presumed legitimate—a presumption historically designed to preserve family peace and status, and to avoid the social and legal harms of illegitimacy determinations. Because no fundamental right was implicated, rational basis review applied. California's § 621 rationally advances legitimate interests in the stability of the marital family, the protection of children from disruptive paternity contests, and the preservation of privacy within the marital unit. The plurality also rejected the child's substantive claim for similar reasons: the Constitution does not guarantee the child a right to establish a legal relationship with a third party as against the marital family where the state's presumption applies. Procedural due process. The plurality concluded that where there is no substantive liberty interest in establishing paternity in this context, the state need not provide procedures to vindicate that interest. Moreover, California law provided some process and alternative avenues (e.g., discretionary visitation statutes) that, at least in theory, allowed courts to consider the child's best interests and third-party contact; thus, even on a process-focused view, the scheme was not constitutionally infirm. Equal protection. Challenges arguing that the statute irrationally discriminated—by denying standing to biological fathers or by treating children differently based on the marital status of their mothers—failed under rational basis. The state's distinctions furthered legitimate aims of protecting the marital family and minimizing paternity disputes. The Court emphasized that the statutory line between children born into a marriage and others is a traditional, nondiscriminatory method of advancing those interests. Concurrences and dissents. Concurring opinions agreed that no constitutional violation occurred but rejected the plurality's call to define liberty interests at the most specific level of tradition, cautioning that such a method could unduly freeze constitutional analysis. Dissenting opinions argued that a biological father who has actually developed a substantial parent–child relationship has a protectable liberty interest, and that a categorical bar denying him any opportunity to be heard was constitutionally suspect. The dissents criticized the plurality's narrow historical framing and urged a more functional, relationship-centered approach consistent with cases like Stanley v. Illinois and Caban v. Mohammed. Ultimately, however, a majority sustained the statute's application in this case.
Why is this case significant?
Michael H. is a cornerstone in understanding the marital presumption and the constitutional status of putative fathers' claims. It teaches that: (1) biology plus a developed relationship does not automatically yield a fundamental right when the child is born into an intact marriage; (2) states may prioritize marital family integrity through strong presumptions that are difficult or impossible for third parties to rebut; (3) in family law/due process cases, how the right is characterized is often outcome-determinative; and (4) fractured Supreme Court decisions can produce a binding judgment without a single majority rationale, requiring students to parse what is precedential (the result and parts of the reasoning) and what is merely persuasive (e.g., the plurality's most-specific-tradition methodology, which did not command a majority). For practice, the case remains a leading authority when litigants challenge conclusive or time-limited marital presumptions and in assessing the constitutional limits of genetic parentage claims.
What is the marital presumption, and how did California's statute apply here?
The marital presumption deems a child born to a married woman living with her husband to be the husband's child. California Evidence Code § 621 (now codified elsewhere) made that presumption conclusive, allowing only the husband or wife to rebut it within a short period. Because Victoria was born into Carole and Gerald's intact marriage, the statute foreclosed Michael (a third-party biological father) from challenging paternity.
Did the Supreme Court recognize a fundamental right for biological fathers to establish paternity over a child of a marriage?
No. The Court concluded there is no fundamental liberty interest, under substantive due process, for an adulterous biological father to assert parental rights against the marital family's legal parentage when the child is born into an intact marriage. Absent a fundamental right, the statute was reviewed for rationality and upheld.
What is the significance of the plurality's 'most specific tradition' approach?
The plurality would define the asserted liberty interest at the most specific level of historical tradition ("adulterous natural father" claims) to assess fundamentality. That approach led to finding no historically protected right. However, a majority of the Court did not endorse that methodology, so while influential in academic debates, it is not controlling precedent. Later courts often cite Michael H. for its outcome and deference to marital presumptions, not as binding authority on how to define tradition.
How does Michael H. relate to other unwed father cases like Stanley, Quilloin, and Lehr?
Stanley v. Illinois protected a developed relationship between an unwed father and his children when the state sought to deem him unfit without a hearing. Quilloin v. Walcott and Lehr v. Robertson recognized that biology alone is insufficient; protection increases as the father grasps parental responsibilities. Michael H. stands for the proposition that even where a biological father has some relationship, the state may still prioritize the intact marital family through a conclusive presumption that the biological father cannot overcome.
What practical lessons does the case offer for modern paternity disputes with genetic testing?
Even with near-certain genetic evidence, legal parentage can remain governed by marital presumptions and statutory windows. Counsel must move quickly where statutes impose short limitations periods and should explore alternative avenues (e.g., best-interests visitation statutes or agreements) rather than assuming DNA results will control. Michael H. underscores that parentage is a legal status, not a purely biological fact, and that constitutional challenges face steep hurdles.