Thanks everyone for the advice, sympathy, and commiseration.
This is one of the reasons I love this forum! Support is a wonderful thing.
After having taken yesterday afternoon/evening to process things, I'll be spending this afternoon and evening getting the letter and paperwork, etc, drawn up. Tomorrow I'll be mailing the letter.
I really hope he just pays me the damn $240. It would make life SO much simpler.
At least when I look at things more-or-less objectively I can appreciate having had this family as clients...they taught (are still teaching) me a
lot.