Fiance owes back child support but child is now 18; if ex goes after him after we marry, will I have to repay with him?My fiance owes back child support but the child is now 18. I have been told that he is still liable, and I am wondering if his ex does go after him, if I will be liable for payment of his old debt if we are married. Attorney answers (0)No Attorney answers yet.Most questions get answered by a lawyer within a few hours. Until then, the questions below might help you. Find Child Support Lawyers |