New Jersey Civil Action Certification In Support of Motion Certification of Service (Guardianship) is a document that must be filed with the court when a motion to establish a guardianship is made. This document certifies that the motion to establish guardianship was properly served on all interested parties as required by New Jersey law. It is available for both adult and minor guardianship. The types of New Jersey Civil Action Certification In Support of Motion Certification of Service (Guardianship) include: Certification of Service by Mail, Certification of Service by Personal Delivery, and Certification of Service by Publication.