Hey, DIM!
Man, I am glad that you and Mrs. DIM are alive and doing well! (GO EAGLES...E-A-G-L-E-S, EAGLES!).
I think your letter is mature and polite, yet firm. If they choose to "shun" you, or not accept you, then THEY made that choice. Let THEM live their lives with a guilty conscience.
I'm proud of you, J.