You can find more details about each process in the next section. Where this article uses the word parent child support overpayment review tool specifically, those statements apply only to parents. This article refers to the plaintiff and defendant(s) in a child support case as parties. In some cases, a parent may be able to prove a permanent change right away; for example, a severe, life-changing injury or illness or retirement at the normal retirement age. Changing a Child Support Payment Amo...