What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template.In the first paragraph, state how you know the person and attest to their character. Everything you need to write a declaration letter to the judge in your custody case: an example, a downloadable template, an outline and tips. A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things. A character reference letter for court child custody is a legal document serving as the recommendation for a parent who wishes to become a guardian. A character reference letter can make a difference in a child custody case. It provides evidence of your parenting abilities.