I'm sorry for your troubles. I am the father of a daughter myself. First of all, the purported bio-dad must start a paternity action, in which he will have the right to order DNA tests. They may show he is not the father. Or they my show that he is. At that point there will be a potentially demanding court dispute over the best interests of the child. Since she has lived all her life with you (and her mother, I assume), there is some chance that the Court will decide not to disrupt her life by intruding a new 'father' into the situation. Even if the Court determine that bio-dad is the 'real' dad, the child's mother has a strong say in matters of custody and placement of the child, and will no doubt argue in favour of the present arrangement. A study is often done, and a guardian ad litem (a lawyer to represent the best interests of the child) typically appointed. Both the entity which does the study and the GAL will issue reports and recommendations concerning what is best for the child, and you and your wife, if you wish and if you can afford it, can have an independent evaluation performed. Consult a skilled family law attorney before the bio-dad takes any court action or otherwise as soon as possible afterward. It's almost always worth the investment. Good Luck.
Answered on Sep 08th, 2015 at 5:11 PM