*1276 Opinion
Miсhael M. (Michael) appeals the dismissal of his paternity action brought against respondents Giovanna F. (Giovanna) and Matthew F. (Matthew) (collectively, respondents) after the trial court sustained respondents’ demurrer to his second amended complaint without leave to amend. 1 Michael contends portions of the Uniform Parentage Act (UPA) as adopted in California (Civ. Code, § 7000 et seq.) are unconstitutional as applied to him because they deny him standing to maintain an action to establish paternity of his child, Brian F. (Brian). He argues the denial amounts to a deprivation of due process and of the equal protection of the laws, and in addition asserts it violates his privacy rights under the California Constitution.
We find Michael has alleged facts that if proven, would establish a protected federal due process interest in an opportunity to establish his paternity, and an opportunity to show that the formation of a parental relation between him and Brian by means of appropriаte visitation or custody orders would be in Brian’s best interests. We find that on the facts of this case, the state’s interest in enforcing the standing provisions of the UPA are outweighed by Michael’s due process interest. We conclude that as applied to Michael, the UPA’s standing provisions are an unconstitutional infringement on Michael’s substantive due process rights. In view of our conclusion, we do not reach his claim that the denial of standing deprives him of equal protection, nor do we reach his claims based оn state law.
We reverse and remand for further proceedings at which Michael may attempt to establish his paternity and that he should be entitled to visitation or custody rights.
I.
Facts and Procedural History
We assume the facts as pleaded in the complaint are true, and draw all reasonable inferences from those facts in Michael’s favor.
(Silberg
v.
Anderson
(1990)
Michael and Giovanna, then both single, lived together periodically beginning in 1986. On October 6, 1988 they becаme engaged to be married. During their engagement, a child, later named Brian, was conceived. In December 1988, after Brian was conceived, Giovanna broke off the engagement. Before the engagement was broken, Giovanna often told Michael she was pregnant with their child. In March 1989, Michael wrote to Giovanna to inquire whether she had confirmed her pregnancy, but received no reply. In the same month, Giovanna married Matthew. Michael did not learn of the marriage until July 1989, when he saw Giovanna, who appeared to be in the last weeks of a full term pregnancy. After seeing Giovanna, Michael sought to speak with her regarding her pregnancy. She refused and eventually obtained an order restraining Michael from further contact with respondents.
On August 4, 1989, Matthew contacted Michael and informed him that Giovanna had given birth to a child, but refused to tell him the birth date or name of the baby. Michael explained he wanted to know whether the child was his because, if it was, he wanted to participate in its upbringing and to contribute to its support. Michael asked permission to visit Brian, but respondents refused. On August 9, 1989, respondents obtained a permanent order from the Contra Costa Superior Court enjoining Michael from further contact with them. On the same day, Michael filed his complaint to declare paternity.
After demurrers to the complaint and the first amended complaint were sustained with leave to amend, Michael filed a second amended complaint in which he requested a declaration of paternity and joint physical and legal custody of Brian. On August 23, 1989, he sent respondents a check for Brian’s support. The check was returned uncashed and Michael then established a bank account for Brian’s benefit.
The respondents’ demurrer to the second amended complaint was sustained without leave to amend on the ground that Michael lacked standing to maintain the action. This appeal followed.
II.
Statutory Scheme
Though Michael did not expressly style his suit as such, the parties and the court below were аgreed that Michael’s action was brought under the *1278 UPA, enacted in California as Civil Code sections 7000-7021. 2 The UPA provides a comprehensive scheme for judicial determination of paternity, and was intended to rationalize procedure, to eliminate constitutional infirmities in then existing state law, and to improve state systems of support enforcement. (9B West’s U. Laws Ann. (1987) U. Parentage Act, comrs. note, pp. 287-290; Legis. Counsel’s Dig., Sen. Bill No. 347, 2 Stats. 1975 (Reg. Sess.) Summary Dig., p. 344.) Relevant here, the UPA expressly specifies those persоns who have standing to sue for a declaration of paternity. (Civ. Code, § 7006 [authorizing actions declaring existence or nonexistence of paternal relation].) 3 Under the statutory scheme, the standing of the various potential parties to bring such an action depends in large part on the existence or nonexistence of a man who is presumed to be the child’s father under the various provisions of Civil Code section 7004. 4 However, it is unnecessary to discuss these rather complex provisions in dеtail. As Michael contends in this appeal, and as respondent concedes, absent adoption proceedings, 5 a biological father has no standing to sue for a declaration of paternity so long as a different presumed father exists and the biological father has been unable to take the child into his home and hold it out as his own. Because Matthew and Giovanna were married when Brian was born, Matthew is the presumed father. (Civ. Code, § 7004, subd. (a)(1).) Thus, Michael lacks standing under the UPA to bring an actiоn either to establish his paternity, or to rebut the presumption that Matthew is the child’s father. This lack of standing gives rise the issue now before us: whether the statutory scheme as applied to Michael impermissibly infringes on his constitutional rights.
III.
Discussion
We begin our discussion with a brief review of the general principles we apply.
There are two species of due process rights. First, a right to fair procedure where the state proposes to interfere with or impair constitutionally protected interests; and secоnd, a substantive right to be free of governmental interference with fundamental constitutional rights absent some compelling reason for interference. (See, e.g.,
Anti-Fascist Committee
v.
McGrath
*1279
(1951)
Michael’s claim that he has been deprived of due process depends on the existence of a constitutionally protected interest in a biological father’s parental relation with his offspring. Though therе is no clear agreement on the exact boundaries of such a right, the extremes are well defined. First, there is no constitutionally protected interest in a parental relation where the basis for that relation is the genetic or biological connection created by impregnation alone.
(Lehr
v.
Robertson
(1983)
Though the United States Supreme Court has not yet spoken directly on the issue, with our Supreme Court’s decision in
Adoption of Kelsey S., supra,
The Supreme Court held a biological father’s federal constitutional rights are infringed by a statutory procedure which allows the child’s mother to unilaterally preclude him from exercising a right otherwise granted to a presumed father to withhold consent to adoption.
(Adoption of Kelsey S., supra,
As is evident, the issue in Kelsey S. is closely related to the problem here. Like the biological father in Kelsey S., Michael has promptly *1281 taken every step open to him to form a relationship with his child. Under the reasoning of Kelsey S. and the federal precedents it discusses, his actions have preserved his “opportunity interest” in being a parent. That interest is protected as a matter of due process. However, the recognition that Michael has a protected interest does not end our inquiry, nor does Kelsey S. or the cases it discusses resolve the issue here.
Kelsey S.
and the line of cases on which it relies arise out of adoption proceedings initiated by a biological mother, in which a biological father raises objections to the termination of his parental rights. (See
Lehr
v.
Robertson, supra,
Here, in contrast, Brian has not been placed for adoption. Rather, the mother and her husband have, like Michael, done everything in their power to establish a stable traditional family unit. Thus, our consideration of Michael’s challenge to the statutory scheme which denies him standing to establish his paternity does not occur in a vacuum. We must balance his acknowledged due process interest in the opportunity to form a parental relationshiр against the countervailing interests of Matthew and Giovanna, and those of the state, in preserving family integrity. Though no California case has discussed the issue in the precise factual context before us, the *1282 importance of that state interest and the manner in which it should be balanced against that of a biological father is by no means unknown territory.
Where a child is conceived during and born into an existing marriage, but has been fathered by a man outside the marriage, the application of both traditional common law and modern constitutional principle have almost universally produced the same result; the biological fattier may be barred by the state from developing a relationship with the child against the married parents’ wishes. The traditional method of achieving this result was the conclusive presumption of paternity, which no one could challenge, least of all the biological father. So long as it is physically possible for the child to have been conceived while the marriage partners were cohabiting, the presumption applies. (See, e.g.,
Michael H.
v.
Gerald D., supra,
491 U.S. at pp. 124-126 [105 L.Ed.2d at pp. 106-108] [plur. opn. of Scalia, J., discussing historical origins of conclusive presumption of legitimacy];
Estate of Cornelious
(1984)
The presumption was designed to avoid imposing the legal and social stigma of illegitimacy on children born to married persons, and to prevent the added expense to the state of providing for abandoned children.
(Michael H.
v.
Gerald D., supra,
The interests of the state and of the biological father are well defined. First, following the United States Supreme Court’s decision in
Stanley
v.
*1283
Illinois, supra,
The nature of the state interest is also established. The state has a continuing interest in the welfare of the child, and in “familial stability.”
(Michelle W.
v.
Ronald W., supra,
However, there is a significant difference between this case and those in which the conclusive presumption of paternity applies. Here, Giovanna’s marriage to Matthew occurred after Brian was conceived, and after both Giovanna and Michael were aware they had conceived a child. Under these circumstances, we believe the state’s interest in preserving family integrity is significantly reduced, since the marriage family did not exist when the child was conceived. Where the marriage partners are joined, both knowing that the child is in útero and there is a different biological father in existence, we find no tenable basis on which to find a threat to the unity of the family flowing from the biological father’s prompt attempt to establish a relationship with the child. Indeed, we find the situation analogous to that in which a divorced parent retains joint custody or visitation rights after the remarriage of his or her former partner, a situation in which the state hаs determined any threat to family integrity is outweighed by other considerations. (See Civ. Code, § 4600 [custody orders]; see
Finnerty
v.
Boyett, supra,
469 So.2d at pp. 289, 292 [on facts similar to those here, court finds little or no threat to family integrity].) That common situation offends no public policy which would protect the second marriage from interference by the divorced parent. Similarly here, allowing Michael to exercise the opportunity interest he has secured by his prompt action does not offend the state’s interest in preserving thе integrity of an existing family against challenge by third persons.
8
(Cf.
Fuss
v.
Superior Court
(1991)
Finally, we discuss the limitations of our holding. First, it is limited to the precise factual situation alleged by Michael. Michael has alleged facts, which if proved, would establish his due process opportunity interest to form a relationship with Brian. We find that on these facts, his intеrest outweighs that of the state in enforcing the standing provisions of the UPA, and that he must be accorded standing to bring an action to establish his paternity. We note, however, that even if his paternity is established, the nature of his relationship to the child as ordered by the court is to be governed by the best interests of the child. (Civ. Code, § 7010, subd. (c)(1).) We do not attempt here to decide what those interests may be, but emphasize the discretion of the trial court to protect those interests by proper orders.
The judgment is reversed.
Kline, P. J., and Peterson, J., concurred.
Notes
Michaеl actually appealed from the order sustaining the demurrer. The order is not appealable, but we will deem it to incorporate an order of dismissal, and interpret Michael’s notice of appeal as taken from that order.
(Beazell
v.
Schrader
(1963)
We use the first names of the parties to protect their identities; no disrespect is intended. (See
Adoption of Matthew B.
(1991)
As noted, we refer to the Uniform Parentage Act as enacted in California as the UPA. We refer to specific sections of the UPA by their California designations, though the numeration of the UPA as drafted by the Commissioners on Uniform State Laws differs from that of the Civil Code. (See 9B West’s U. Laws. Ann. (1987) U. Parentage Act, pp. 287-345.)
The text of Civil Code section 7006 appears in the appendix to this opinion, post.
The text of Civil Code section 7004 appears in the appendix, post.
A biological father may bring an action to establish his paternity where the mother puts the child up for adoption. (Civ. Code, § 7006, subd. (d).) In this situation, the biological father’s right of action exists whether or not a different presumed father exists.
Thе conclusive presumption does not apply where, as here, the child is conceived out of wedlock. (Evid. Code, § 621, subd. (a); see
Michelle W.
v.
Ronald W., supra,
Evidence Code section 621 provided in relevant part: “(a) [ejxcept as provided in subdivision (b), the issue of a wife cohabiting with her husband, who is not impotent or sterile, is conclusively presumed to be a child of the marriage.” The statute provided for rebuttal of the presumption by the mother or her husband within two years of birth.
(Michelle W., supra,
We reject Matthew and Giovanna’s reliance on the United States Supreme Court’s decision in
Michael H.
v.
Gerald D., supra,
Nor do we reach Michael’s suggestion we could order visitation pendente lite, and on that basis grant him standing under the provision that he may be presumed Brian’s father by taking him into his home and holding him out as his child. (Civ. Code, § 7004, subd. (a)(4).) In view of our Supreme Court’s rejection of the very similar notion of “constructive receipt” in Adoption of Kelsey S., supra, 1 Cal.4th at pages 829-830, the suggestion is of dubious merit in any case.
