Q: What forms need to be filed when a biological father needs to claim paternity of biological child?
Biological mother of child is married to a different man.
Start with these California Judicial Council Forms: Petition to Establish Parental Relationship (FL-200), Summons (Uniform Parentage — Petition for Custody and Support) (FL-210), and Declaration Under Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA) (FL-105). You will need to file them in the county where the child lives. There are possibly local forms you will need that vary by county. Most family courts have self-help desks that you can consult.
Establishing Paternity under the under circumstances you describe is going to be challenging. You should seriously consider consulting an attorney.
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