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 title properly, but only once in the salutation. Customer: I need a sample letter asking a judge for probation at my son's readiness hearing (he's 20 years old). Dear Judge (Name of the Judge):. A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things. Write the date and the judge's address in the top left.