or a signed agreement by the parties as to whom the father is?
Family Law Attorney
Not legally, no. Scientifically, biological paternity is established to an almost certainty by testing. However legally it is not so simple. If a woman is married, her husband is the legal father of the child regardless of who the biological father is unless a court disestablishes his paternity and declares someone else the father. So paternity as a consequence of marriage would be by operation of law. In every other instance, paternity must be established by court order. Signing the affidavit that you sign to be on a birth certificate establishes a presumption of paternity, but it does not establish paternity.
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