Thank you for allowing me to assist you.
This depends on what state you are in and the relationship of the other "father" to the child. Is that person married to the mother?
Give me a moment...
You can file a Petition to Establish Paternity and request genetic testing. It is up to the Court to decide whether or not to grant the DNA testing. If the judge feels that the child's life would be too disrupted by questioning paternity at this point, the judge can simply deny your request, leaving you with no recourse. The Court could, however, allow you to proceed with DNA testing and adjudication of parentage.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).