My daughter is 15 now I have never received any child support before last week.. now I do not have custody of my girl my sister does now all of the sudden they pick him up for back support.. which is not need I do not have our child.. how does he go about signing off his rights which is what he wants to do and which is fine with me . I was fia for 2 years is that all he'll have to pay back if he signs off?