The forms below are some of the most common forms used in the Domestic Relations Division, but there are many more. Complete the on-line application for free child support services if you live in Illinois and the dependent child(ren) lives with you.Use this form to ask the judge to give you parental responsibilities for a child. This includes parenting time (visitation) and decision-making power (custody). Download and complete Divorce, Child Support, and Maintenance forms from the Illinois Office of the Courts. The Child Support Application is available for download in Portable Document Format (PDF). It can then be filled out on your computer. This document provides an overview of the basic steps to file for custody of a child in Cook County,. Illinois. To fill out the Supplemental. Petition, start at the top and fill in the blanks.