There are certain forms you must fill out and file with the court to open a case. For information about how to fill out and file court forms, please read Basics of Court Forms.Joint Petitions for Custody Miscellaneous Forms. For information about how to fill out and file court forms, please read Basics of Court Forms and Filings. Step 2: Fill out the following forms: Confidential Family Court Information Sheet. Petition to Establish Custody and Visitation. You can file a paternity or a child custody case. The instructions and all the forms needed to open a paternity or custody case are in this section. Step 1: The Second Judicial District Court requires all documents to be electronically filed using the eFlex system. To file electronically, both parties must.