If you would like to change a child support or custody order that resulted from a SAPCR, you will need to file with the court for a modification. The most common divorce modifications requested involve child support, child custody, and spousal support.Here's what to expect when you request for a modification of your child support order. Click here to learn the steps in the modification journey. Any party with courtordered rights regarding children involved in the divorce is eligible to file for divorce decree modification. Step 1: Fill out your court forms. Fill out the following starting forms: â—‹ Petition to Modify the Parent-Child Relationship. Respond to a law suit in a family law case. To modify a divorce decree in Texas, you must demonstrate a material and substantial change in circumstances. Under Texas law, either parent may file a petition seeking child custody modification anytime.