Supplemental Petition for Modification of Child Support. Form Number. 12.905(b).How can I request a review or change of my child support order? What samples of letters can I use to request the father to start paying the ordered child support? Additional resources include a directory of local self-help centers. This document is a sample form letter designed for individuals seeking a downward modification of their child support obligations. Payment Records Request. Need help filling out a common child support form? We have videos to help! This is a packet of various forms that may be used to file a simple motion OR an Answer to a Petition.