Establishing Paternity Laws in California

What “Establishing Paternity” Actually Means

Establishing paternity means establishing legal parentage: turning a biological relationship, or a legal status like marriage, into an official parent-child relationship on record with the court and the state. For unmarried parents, that relationship isn’t automatic just because it’s biologically true.

A birth certificate entry or an at-home DNA test doesn’t, by itself, necessarily establish every legal right and obligation associated with parentage; its legal weight depends on how it came to exist, such as whether it reflects a signed declaration or a court judgment. California law recognizes specific presumptions, declarations, and court orders as the bases for establishing a legal parent-child relationship. When both parents agree and are eligible to sign a valid declaration, the process can be substantially simpler than a contested court proceeding.

The Three Paths to Establishing Paternity in California

California parentage law offers several ways to establish a legal parent-child relationship, but for most families weighing their options, three common routes cover the large majority of cases: the marital presumption, a Voluntary Declaration of Parentage, and a court petition to determine parental relationship. Of these, a Petition to Determine Parental Relationship is the one that begins with a court proceeding; the other two can be resolved without first filing a case, though a dispute about either can still end up in front of a judge.

The Marital Presumptions

California Family Code § 7540 creates a conclusive presumption that a child is a child of the marriage when spouses cohabited at the time of conception and birth, unless a court finds the husband was impotent or sterile at conception and the child wasn’t conceived through assisted reproduction. ^[1] Because the presumption is conclusive, it controls even if someone else is later shown to be the biological parent, unless the specific procedure in Family Code § 7541 is used: a motion for genetic testing, generally filed within two years of the child’s birth, and only by the husband, the presumed father, or the child through a guardian ad litem, subject to its own exceptions. ^[2]

A related but different presumption arises under Family Code § 7611(a): a person is presumed to be a parent if they are or have been married to the child’s natural mother and the child was born during the marriage, or within 300 days after the marriage ended by death, annulment, invalidity, or divorce. ^[3] Unlike § 7540, this presumption is rebuttable rather than conclusive, and California recognizes other parentage presumptions that can apply at the same time, so which one actually controls depends on the full set of facts. We walk through which presumption fits your situation during your first conversation with us, so you know where you stand instead of assuming one rule automatically covers you.

Voluntary Declaration of Parentage (VDOP)

California allows eligible parents to establish parentage by signing and filing a Voluntary Declaration of Parentage without first filing a court case, and there’s no state fee to do it. Both parents typically sign at the hospital right after birth, though it can also be completed later through the Department of Child Support Services or another authorized witnessing agency; confirm the current locations and process directly with DCSS, since procedures can change. Once filed, it carries the same legal force as a judgment of parentage, clearing the path for custody, visitation, and child support orders. ^[4]

Not everyone is eligible to sign one. You generally qualify if the birth parent is unmarried and the person signing is the only possible genetic parent, or if you and the other parent conceived the child through assisted reproduction using donated sperm or eggs from someone other than a spouse. ^[10] A VDOP isn’t valid if the child was born through a surrogacy arrangement, if another legal parent is already on record, or if there’s genuine uncertainty about whether the child resulted from a donation or from intercourse; those situations generally call for a court proceeding instead.

There’s a narrow window to change your mind. Either parent can rescind a signed declaration within 60 days of the date it was signed by both parents, whichever signature came later, by filing a rescission form with the Department of Child Support Services, and no court hearing is required for a timely rescission. That said, rescission generally isn’t available once a court has entered a custody, visitation, or child support order in a case involving the parent who wants to rescind; a court motion takes its place in that situation. ^[5]

It’s the cheapest and fastest path on paper, since the state doesn’t charge a fee for it. Our role is making sure you’re actually eligible, and that you understand exactly what you’re agreeing to, including the trial rights you’re waiving, before you sign anything that isn’t easy to undo once the rescission window closes. That’s the whole idea behind how we work: no surprises now, and none later.

Petition to Determine Parental Relationship

When one parent won’t sign, disputes the biological connection, or can’t be located, the path generally runs through Superior Court instead. Depending on the circumstances, a parent, an alleged natural father, a presumed parent, the child, or the local child support agency may have standing to bring a parentage action asking a judge to decide. ^[6]

A court proceeding generally involves more procedural steps and potential costs than establishing parentage through a valid declaration, particularly when parentage is disputed. That’s exactly why we build a game plan before we file anything: we discuss the likely procedural steps, potential costs, and factors that can affect timing, so you have a realistic picture instead of a guess.

How MeyerPink Law Handles Your Paternity Case

We built our process to replace guesswork with peace of mind, whether your case is a quick form or a full court filing.

• Quick Chat: we talk through your situation, whether it’s a first paperwork filing, a disputed case, or a declaration you’re not sure you should have signed.
• Game Plan: we discuss which path may apply, the likely procedural steps and potential costs, and the factors that can affect timing, before you commit to anything.
• Execute: we prepare the paperwork, represent you at hearings when needed, and keep you updated at each stage, with virtual visits available when getting to an office isn’t realistic.

Your case is handled by our family law team, with work led by April Meyer, a Certified Family Law Specialist, so the strategy behind your paperwork reflects real experience with California parentage law rather than a generic template.

When Genetic Testing Comes Into Play

Genetic testing can also happen voluntarily outside of court, but a private DNA test doesn’t by itself establish a legal parent-child relationship. Inside a parentage proceeding, the court may order the parties and the child to submit to genetic testing when the statutory requirements are met, and a refusal to comply with a properly issued order can have consequences in the case, including having the question of parentage resolved against the refusing party. ^[7]

Genetic testing isn’t available in every situation. California law generally doesn’t allow it to challenge the parentage of a parent established through assisted reproduction or a gestational surrogacy arrangement, and a court won’t order testing before birth. If the child already has a presumed parent under the § 7540 marital presumption, a testing request follows the separate procedure and deadline in § 7541 rather than the general rule described above.

In proceedings covered by the applicable court order, the standard practice is for the county to advance the cost of the lab, the examiner, and the expert witness, subject to later reimbursement or allocation as the court orders; exact cost-handling can vary by county and by the specifics of the case. ^[8]

Rescinding or Challenging a Signed Declaration

A signed Voluntary Declaration of Parentage doesn’t have to be permanent, but the process for changing it depends on timing. This is an overview, not a step-by-step guide to unwinding a declaration; if you’re actively trying to challenge one, the specific facts of your case determine which procedure applies, so talk with us before filing anything.

Within the first 60 days, either parent can rescind it simply by filing a rescission form with the Department of Child Support Services, no court hearing required, unless a custody, visitation, or child support order has already been entered in a case involving that parent. ^[5] After that window closes, a parent who signed the declaration can still challenge it in court, but only on the grounds of fraud, duress, or material mistake of fact, and generally within two years of the declaration’s effective date. ^[9] A person who did not sign the declaration, such as another presumed parent, follows a separate standing and timing rule, so the right procedure depends on who’s bringing the challenge.

What Changes Once Paternity Is Established

• Custody and visitation: a father gains standing to ask the court for parenting time or a role in decision-making.
• Child support: either parent may seek a child support order once parentage is established; the amount and payment obligation are determined separately under California’s child support guidelines.
• Birth certificate: California’s vital records process may allow the child’s birth record to be amended to reflect the parentage determination, though the exact procedure depends on how parentage was established.
• Inheritance and benefits: your child may gain inheritance rights under California’s Probate Code, along with potential access to health insurance, Social Security, and veterans’ benefits through the newly established parent, though each program and inheritance issue has its own eligibility and proof requirements.

Paternity is often just one piece of a larger custody or support picture. Our team handles divorce, custody, and support matters as part of the same family law practice, so your case doesn’t get split across different attorneys.