Child Support Forms ; 4-3a. Petition (Commissioner).It is not so hard if you go fill out paperwork from the court. Use our printable child support demand letter template to require someone to pay their owed child support. Download it for free here. A custodial parent can waive or forgive all arrears owed to him or her directly. This guide includes forms and instructions for a letter and affidavit to request that the court register an out-of-state custody order in Texas. Customer: I am in need of a sample letter regarding my child support case. Harris claims that he was not in arrears in either child support, alimony, or attorney fees; he had removed the child from his dental insurance at Mrs. Here's what to expect when you request for a modification of your child support order.