Qualified Medical Child Support Order. Fill in all the blanks on the petition to the best of your knowledge, including the caption and case number at the top.The name and address of the other parent. How to Request a Modification. Please complete an application for support online utilizing Pennsylvania's EServices filing system. Use this link: E-Services. To file your request, review the instructions worksheet, then complete the Motion to Modify Child Support and the necessary Financial Statement. 1. Fill out a child support modification petition. 2. File the petition with the Family Court that most recently established your order. 3. In order to complete this form, you will need a copy of your existing child support order.