From your explanation, the man IS in fact the biological father. The relevant statute, however (NRS 126.053), provides that a person who has signed such an acknowledgment of paternity may rescind the acknowledgment "within 60 days" after it is signed. If he has done that, and you want him bound to an obligation for support (and also to gain the right to seek custody or visitation rights) you (or he) will have to file an action for paternity, custody, and support. It is difficult to see what is really going on in your facts, but you should probably seek specific advice from a family law specialist in this office or some other family law firm.
Answered on Jan 08th, 2015 at 4:46 PM