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? Decatur, IL Viewed 21 times. Posted about 1 month ago in Child Support Flag as objectionable 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. - Is this your question? Add additional information Answer this question Add to list Share this Answers (0) No answers yet Here is some preliminary information and guidance regarding your legal situation while you wait for an attorney in your area to respond. Free and Low-Cost Legal Resources in Illinois Related Child Support questions Is my husband responsible for child support after child has turned 18 - My husband has been paying child support for his son since he divorced his ex-wife. About 2 years ago, the ex went to Child... more 3 answers. Sacramento, CA. Viewed 1,788 times. Posted about 1 year ago in Child Support paternity test revealed that child is not mine, i owe back child support under CA law what can i do to appeal child support - I found out about a year ago by private paternity test and admission... more 3 answers. Los Angeles, CA. Viewed 1,986 times. Posted about 1 year ago in Family Is it still possible to collect back child support that is due if child turned 18 this year - HELLO, I HAVE BEEN DIVORCED FOR OVER4 YEARS, IT WAS IN THE DIVORCE DECREE THT MY EX PAY CHILD SUPPORT.... more 1 answer. Angelica, NY. Viewed 335 times. Posted about 1 year ago in Child Support Back to Search Results Ask a Question Get free answers from real lawyers. Question Question details City and state Required Next question: what is most likely to happen? Previous question: Can a village put in an oridinance and make you comply after the fact?