If the child is two, and no one has questioned paternity, your name is not going away absent someone else coming in and asserting himself as the father and the fact of the pregnancy was hidden. Mama saying you are not, with nothing more, is not going to cut the cheese.
You and your decree and custody order appear to have a real need to find your way to the office of counsel. Up to you whether you again engage your prior counsel or seek out someone new.
I agree with the answers of my distinguished colleagues. Retain counsel and discuss this matter in detail with counsel. Good luck.
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