This is a how-to guide on interrogatories and requests for production in Washington divorce and family law cases. A person who receives interrogatories has 30 days to respond in writing.You must answer each interrogatory separately and fully in writing under oath. Interrogatories are a set of written questions that one side in a lawsuit sends to the other side to gather information and evidence. Method of Service and Due Date of Responses. If personally served, responses to interrogatories are due within thirty (30) days of service. Here are some sample interrogatory objections, a cheat sheet that might help you determine how to object to interrogatories. Edit, sign, and share Discovery Interrogatories from Plaintiff to Defendant with Production Requests - Washington online. King County Superior Court has approved pattern interrogatories for use in automobile tort cases. "Interrogatories" are written questions to the other side.