Everything you need to write a declaration letter to the judge in your custody case: an example, a downloadable template, an outline and tips. Introduction to representing yourself in Pennsylvania.Each of the documents listed below inculde a blank form and the instructions to fill out that form. This article provides a comprehensive guide to writing a declaration letter for child custody cases, including a sample letter. If there is a Children's Lawyer or Child Advocates office, ask them to investigate. Ask them to present an opinion on which parent is best. This purpose of this packet is to provide you with the information and documents you may need to start or respond to child custody actions. Fill in the top part of this form with your name and address and the defendant's name and address. You are the plaintiff. Complete, date and sign the Cover Sheet for the Complaint for.