So my daughter (15) has decided to permanently live with her father so he now has legal custody. He owes me back pay in over $16,000, could he put me on child support? If so what happens to the back pay. Or some sort of helpfully advice. I get SSDI and she gets a payment as dependant I read somewhere that I could use it as child support or have payment deducted from his arrears, is this true. The child support order was given in Texas he lives in New Mexico.