Everything you need to write a declaration letter to the judge in your custody case: an example, a downloadable template, an outline and tips. These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County.Fill out the Certification in Support of Motion (Form B). Type or print the reasons the court should agree to your request. Reasons must be based on facts. First, download and complete the request form. This article provides a comprehensive guide to writing a declaration letter for child custody cases, including a sample letter. Learn how to request a temporary, immediate child custody or parenting time order while you wait for your case to go through the system. What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template.