You can file a petition for child custody in your county's Superior Court. If you are divorcing, the petition will be included in your divorce papers.This article discusses registering other states' custody and support orders in Texas so that Texas courts can change and enforce them. Low Cost Child Custody Evaluation. First, fill out a case filing information form. Downloadable forms for eFiling, Divorces, and Suites Affecting the Parent-Child Relationship, Child Support, Hail Claims, Legal, LegalEase, and Passports. The steps to get child custody include filing a petition, developing a parenting plan, and going to court. There is a form you can fill out for a commemorative certificate of adoption that Bexar County will send to you free of charge if you like. Join us today as I file my application to be placed on the ballot. Mil gracias to all who signed my petitions.