The interrogatories must not exceed 30, including all subparts, unless the court permits a larger number on motion and notice and for good cause. The interrogatories must be served on the party to whom the interrogatories are directed and copies must be served on all other parties.A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. All parties to a family law proceeding must complete certain paperwork that provides necessary information to the other party and to the court. It is intended to be a quick reference for lawyers and judges on many recurring discovery problems. Interrogatories are only exchanged between the actual parties in a lawsuit. The parties means the plaintiffs and defendants. Palm Beach, FL 33480-4323. The federal rules require a party to supplement all discovery responses, including initial disclosures, without further request from the opposing party.