Establishing Paternity in California — Process, DNA Testing, and Rights

Paternity is the legal determination of fatherhood. In California, establishing paternity is the gateway to a father's custody and visitation rights, the child's right to financial support from both parents, and the child's access to the father's insurance, inheritance, and other benefits. Understanding how paternity is established, what DNA testing involves, and how paternity affects custody and support is essential for unmarried parents.

Why Does Paternity Matter?

California law treats children born to married couples differently from children born to unmarried parents. When a child is born to a married couple, the husband is presumed to be the legal father under Family Code section 7611 — no additional proceeding is required. When a child is born to unmarried parents, there is no automatic legal father. Until paternity is established, the child has no legal father — meaning the child has no right to child support from the man believed to be the father, no right to inherit from him, no right to his medical or death benefits, and no claim to Social Security benefits through him. The man believed to be the father has no legal right to custody or visitation until paternity is established.

How to Establish Paternity in California

Paternity can be established in California through several methods. The most common is a Voluntary Declaration of Paternity (VDOP) — a form signed by both parents, typically at the hospital at the time of the child's birth, in which both parents acknowledge that the identified man is the child's father. A VDOP signed by both parents and filed with the California Department of Child Support Services creates a legal presumption of paternity that has the same effect as a court judgment. Once a VDOP is established, it can only be rescinded within 60 days of signing or challenged in court within two years on limited grounds.

Court-Ordered DNA Testing for Paternity

When paternity is disputed, a court action is necessary. Either parent — or the California Department of Child Support Services on behalf of the child — can file a petition to establish paternity. The court will order genetic testing — DNA testing — if paternity is disputed. DNA paternity testing compares the genetic material of the child, the alleged father, and ideally the mother to calculate the probability of paternity. A result showing 99% or higher probability of paternity is considered conclusive. California courts accept test results from accredited testing facilities; home DNA tests are not admissible in court. Once DNA testing establishes paternity at the required confidence level, the court enters a judgment of paternity.

Paternity and Child Support

Establishing paternity is a prerequisite to obtaining a child support order in California when the parents are not married. Once paternity is established by VDOP or court judgment, a child support order can be entered based on both parents' incomes and the timeshare. The California Department of Child Support Services (DCSS) has authority to establish paternity and child support orders administratively — without a court proceeding — in some circumstances. Parents who are unsure whether to establish paternity through DCSS or through a private family law action should understand that DCSS proceedings focus on support, not on custody, and that a private action may be appropriate when custody is also in dispute.

Paternity and Custody Rights

An unmarried father who has not established legal paternity has no enforceable custody or visitation rights. A mother can prevent the father from seeing the child without legal consequence until paternity is established and a custody order is entered. Once a judgment of paternity is entered, the father has the same right as any other legal parent to seek custody and visitation. The standard is the best interests of the child — the same standard applied in any custody proceeding. A father who has been actively involved in his child's life will have a stronger factual record in support of meaningful custody time.

Presumed Fatherhood vs. Biological Fatherhood

California law distinguishes between presumed fathers and biological fathers. A presumed father is one who meets the criteria of Family Code section 7611 — he was married to the mother when the child was conceived or born; he signed a VDOP; or he received the child into his home and openly held the child out as his own. A biological father is the man whose DNA matches the child's. These two categories can conflict — for example, when a child is born to a married woman and the biological father is not her husband. In such cases, California courts weigh the competing claims to parentage and may recognize both the presumed father and the biological father as having parental rights in limited circumstances.

Challenging Paternity in California

A man who has been established as the legal father — whether by VDOP, presumption, or court judgment — can challenge that determination in limited circumstances. A VDOP can be challenged within two years of signing on grounds of fraud, duress, or material mistake of fact. A court judgment of paternity can be challenged if new DNA evidence establishes non-paternity and the challenge is in the child's best interests. Courts balance the child's interest in financial support and stability of the parental relationship against the genetic truth when evaluating paternity challenges.

Furubotten Law, APC handles paternity establishment, genetic testing proceedings, and custody matters for unmarried parents throughout Orange County and Riverside County. Call (714) 795-3862 for a complimentary case evaluation.

Paternity Fraud in California — Legal Remedies and Challenges

Paternity fraud occurs when a man is falsely identified as a child's biological father — either through intentional misrepresentation or through the presumption of paternity that attaches to a husband when a child is born during a marriage. California has a Voluntary Declaration of Parentage (VDOP) system that allows unmarried parents to establish paternity without a court order by signing and filing the VDOP form. A VDOP can be challenged within two years of signing if the man was not given required disclosures, if he was not actually the biological father, or if the VDOP was signed under fraud, duress, or material mistake of fact. After two years, a signed VDOP is treated like a court judgment of paternity and can only be challenged on very limited grounds.

A husband who signed a birth certificate during marriage and later discovers he is not the biological father faces a more complex situation. California's marital presumption of paternity — codified in Family Code section 7611 — presumes that a husband is the father of any child born during the marriage. This presumption can be rebutted by genetic testing, but only within a limited time window and only by certain persons (typically the husband, the mother, and the biological father). California courts balance the interest in biological truth against the child's interest in maintaining existing parental relationships when deciding whether to allow rebuttal of the marital presumption.

How to terminate parental rights in California: parental rights can only be involuntarily terminated through a court proceeding finding that the parent has engaged in conduct meeting one of the statutory grounds (abandonment, severe neglect, abuse, substance abuse, incarceration for a felony, etc.) and that termination serves the child's best interests. How to terminate child support in california through voluntary relinquishment of parental rights is not straightforward — voluntarily relinquishing parental rights in California does not automatically terminate child support obligations. A parent cannot simply sign away their child support obligation by agreeing to terminate their parental rights. How to relinquish parental rights in California voluntarily requires a court proceeding, a finding that it is in the child's best interests, and typically the availability of a new legal parent (such as a stepparent) to assume the parental role. Paternity law in California addresses both the establishment of paternity and its consequences for custody, support, and inheritance.