Form Interrogatories are a list of questions on a court form. The person performing the service must sign a proof of service form stating what they served, who it was served on, and the date of the service.Prepare the Certificate of Service – A Certificate of Service is a document that confirms you served a certain document. How do I fill this out? As a matter of law, your attorney was required to file a certificate of service of the responses served on the opposing counsel. Here you will find information about the various methods for obtaining financial records and other evidence for use in your family law case. Find out what interrogatories are, how they work in family law cases, and who needs to be involved. Although it is not an absolute requirement, you would be better served if an attorney assists you in preparing the discovery responses. Special Interrogatories are questions that are not included in the court's Form Interrogatories. Form interrogatories are issued early in the proceedings in nearly every case.