Maybe youd got a bit loud, but still seems way over the top to ban you & cut you off! Youre well out of it, he sounds like a right nutter! Send your sister a text, leave it ambiguous as he may read her messages& mail too- just say "sorry if we disturbed your hubby- but id love to still see you, maybe just you& I could get together at mine next time?" Then leave it to her- or is there a time when hes out and she is in alone? Maybe you could go speak to her then, ask her why it happened, tell her you'd help her leave if she wishes?- but stay at the door, in case he turns up, you don't know if he'd turn nasty! Never put anything like that in a text or letter to her, he probably reads it all. If not you'll have to accept the way they are probably.