A demand letter is an official notice requesting money, possession of assets, or action on a legal matter. You will need one copy of the civil complaint with original signature for the magisterial district judge.These are the forms to use to enforce any Court order and ask the Court to hold the other person in contempt for violating the Court's Order. Click on your parish in the drop-down menu below to see available services and forms in your area. Some jurisdictions have self-help centers that you can visit. 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.