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. In this article, we will discuss how to write a formal letter to a judge, along with the proper format and a sample letter.Writing a character letter for a judge can be a daunting task. Here are nine essential tips for writing an effective sentencing letter. These are the official forms for use in Family Court proceedings. Family members are good witnesses as well, but remember that a professional or third party is more believable to a Judge than a family member. These are the official forms for use in Surrogate's Court proceedings.