Form Interrogatories are a list of questions on a court form. Each interrogatory shall be full and complete in and of itself.Effective immediately, for Civil, Family, and Probate eFilings, the upcoming hearing date must be included in the filing description box. Have the forms the clerk gives you served on all defendants in this case: a. Interrogatories allow the parties to ask who, what, when, where and why questions. Professional and experienced legal document preparation service supporting the public needs of Contra Costa, Alameda and Solano Counties. Submit the legal documents you want served and basic service information. Auto-fill and address verification make it fast and easy. Get help filling up these out from A People's Choice for the best accuracy. GC-310 Petition for Consultation of Probate Conservator.