You may submit a letter to the judge through the Clerk of Court. In this article, we will discuss how to write a formal letter to a judge, along with the proper format and a sample letter.I am writing this letter on behalf of a family member mine who is presently before you on criminal charges and is due to be sentenced shortly. Use the judge's professional address, which is usually the courthouse in which he or she works. You cannot write a letter to the family court judge. This would be considered an ex parte communication. Writing a character letter for a judge can be a daunting task. Here are nine essential tips for writing an effective sentencing letter. What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template.