What Happens if You Have a Child With Someone Else While Married in Texas?

Few family situations create more legal complexity than having a child outside of marriage—while still legally married. The questions pile up fast: Who is the legal father? What happens during the divorce? Does it matter if you and your spouse were separated?

Here’s a quick summary of what Texas law says:

• Texas does not recognize legal separation. Until a divorce is finalized, separated spouses are still legally married.
• The spouse is presumed to be the child’s legal father, even if someone else is the biological parent.
• Paternity can be established or disputed, but it requires formal legal action.
• An unresolved paternity issue can complicate a divorce, including child support and custody orders.

At The Valenzuela Law Firm, PC, we guide clients through divorce and family law situations with clarity, compassion, and a strategy built around your specific needs. Let us help you find a way through the legal complications your family may be facing.

Does Separation End a Marriage in Texas?

Texas law does not recognize legal separation. No matter how long you and your spouse have lived apart, you remain legally married until a court finalizes an official divorce. This is a significant reality, because your marital status at the time of a child’s birth determines how Texas law assigns legal parentage.

Who Is the Child’s Legal Father Under Texas Law?

Under Section 160.204(a) of the Texas Family Code, a man is legally presumed to be a child’s father if:

• He is married to the mother when the child is born, or
• The child is born before the 301st day after the marriage ends, whether by death, divorce, or annulment

This presumption applies regardless of biology. That means if you have a child with someone other than your spouse while you’re still married, your spouse may be the one recognized as the legal father under Texas law.

How Can You Establish or Dispute Paternity?

Changing the legal presumption requires formal action. Texas law offers a few options to address this:

• Acknowledgment of Paternity (AOP): The biological father and mother can sign an AOP to establish legal parentage. However, an AOP is void if it names a presumed father, unless the presumed father also signs a valid Denial of Paternity.
• Denial of Paternity (DOP): The presumed father (in this case, the spouse) can sign a DOP to relinquish legal parentage. This is only valid if an AOP from another man is filed simultaneously.
• DNA Testing: Genetic testing can establish paternity if results show at least a 99% probability and a combined paternity index of at least 100 to 1. Genetic testing can also be used to disprove paternity.

Do Paternity Matters Affect the Divorce Process?

Unresolved paternity issues don’t stay separate from ongoing divorce proceedings. If paternity is disputed or otherwise unaddressed, a divorce cannot be completed. Legal paternity must be established for the divorce to be finalized. 

Protecting Your Family’s Future With Legal Guidance

Paternity and parentage issues are among the most sensitive and legally significant matters in Texas family law. Whether you’re trying to establish a biological father’s rights, challenge a paternity presumption, or simply understand how this affects your divorce, the decisions you make now will have lasting consequences for your future.

The Valenzuela Law Firm, PC is here to help you navigate the challenges of the divorce process with confidence. Contact our team today to schedule a consultation and get clear legal guidance for your family.