When a child is born during a marriage, California law may presume that the birth parent’s spouse is also the child’s legal parent. That presumption can be challenged in limited circumstances, but strict deadlines and standing requirements may apply.

Biology Is Not the Only Consideration

Parentage law protects established family relationships as well as genetic connections. A DNA result does not automatically displace a spouse who is already recognized as a parent.

The court may need to consider marriage-based presumptions, existing parentage judgments, voluntary declarations, assisted reproduction, and any other person claiming presumed-parent status.

The child’s stability and existing parental relationships can be highly significant.

A Two-Year Period May Apply

A challenge to certain marriage-based parentage presumptions generally must be brought within two years after the child’s birth. The people authorized to bring the challenge may include a spouse, another qualifying presumed parent, or the child through a representative.

The request ordinarily must include a factual declaration explaining why parentage is genuinely disputed. Missing the deadline can severely restrict later genetic-testing or set-aside options.

Different rules may apply when assisted reproduction, surrogacy, fraud, a prior judgment, or another specialized circumstance is involved.

Genetic Testing Is Not Always Available

Testing may be ordered when genetic parentage is legally relevant, but it cannot be used to bypass an established judgment or a controlling parentage rule. A person without the required legal status may lack standing to demand testing.

Even when testing excludes an established parent, the court may need to address competing presumptions and the child’s existing relationships before entering a new judgment.

A parent should not use private test results as authority to stop support or disregard custody orders.

Early Action Is Essential

Marriage records, birth records, declarations of parentage, genetic testing, assisted-reproduction documents, and evidence of each person’s relationship with the child should be gathered promptly.

A California parentage attorney can determine whether a challenge is timely, identify everyone entitled to notice, and evaluate whether testing is legally relevant. Existing parentage, custody, and support orders remain binding unless properly set aside or modified.