I just found out that he dropped out of high school when he was 15 and that he was no longer living with his aunt at this time I was paying child support. I live in MO and the court order is from IA . My son is now 19 and lives with me. I'm thinking about getting an attorney to amend the court order and have the amount for the back child support applied to the balance since he was not living there when I was paying child support . What steps do I need to take?