Hi Scrant, I would lose most of that and just keep this:

I'm sorry, but the day you left we stopped being family.

I wouldn't say it nastily, and when you have said it, just turn with a regretful and dignified air and leave. Don't wait for a reaction.

This is enforcing your own boundary (we won't do family stuff while you are with OM) and it is also a truth dart.

T 13 M 7
Me 48 H 46
SS 15
BD 7.14 PA
D final 5.16 (H filed)

We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus