Petition for (Custody) (Visitation). Petition (Violation of Support Order).IV-D Child Support Courts are located in the Family Law Center at 1115 Congress, Houston, TX 77002. 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. This online program from Family Legal Care guides you through filling out a Petition for Child Support. All child support forms are categorized and linked below as downloadable files. Select the category you need to see the corresponding forms. A custodial parent may file a petition with their local child support agency. No. Only a judge can change a . Are there do-it-yourself forms I can use to file a ?