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).The forms below are some of the most common forms used in the Domestic Relations Division, but there are many more. The other parent has 30 days to respond. This document provides an overview of the basic steps to file for custody of a child in Cook County,. Illinois. Fill out and sign or esign your forms. Make four copies of each form. Our real-time chat function connects you directly with our team. Your petition must include basic information about both parents and your child, and your detailed request for visitation. My ex has filed a petition to modify parent child relationship.