All Illinois Courts must accept these forms. Petition for Change of Venue.Your Motion to Change Venue package should include: 1. How would you write your letter to a judge in family court regarding why you want a modification done in your case? Provide a Legal Basis: In your motion, you should provide a compelling legal basis for the change of venue. Download and complete Motion and Notice forms from the Illinois Office of the Courts. Customer: I need assistance with how to file for a change of venue with my family custody case. I used to reside in NM but have since moved to Texas. If the child is primarily with you, register your prior judgment in the county you are in and then file a request to change venue. The Illinois Supreme Court has set out a formal process for the development, review and approval of standardized forms in all areas of law.