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. Downloadable forms for eFiling, Divorces, and Suites Affecting the Parent-Child Relationship, Child Support, Hail Claims, Legal, LegalEase, and Passports.These forms are for use in district court. Some Texas counties conduct family matters in county court. A demand letter is a letter you can send to try to resolve a dispute before going to court. Demand letters are often sent in cases where someone owes money. Enjoy our new and improved forms page! Petition - Use this form to begin your small claims case.