Proof of parentage
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) A judicial determination of parentage conclusively establishes the paternity of a child.
(b) Except as provided in paragraph (a) of this section, a child born to the wife of a married person is presumed to be the child of the wife's husband. This presumption may be rebutted only by clear and convincing evidence that the husband is not the father of the child.
(c) When paternity is not established under paragraph (a) or (b) of this section, paternity is determined by a preponderance of the credible evidence as defined in § 1201.56(c)(2) of this title.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.