You have two young children - use 'em as an excuse. No one will ever beg you to come over (or shame you) if you mention that one of them has a stomach bug.
She accused step brother of molesting her daughter about 15 years ago and then came clean in court that she lied because she was pissed at him. She put his dog down when he was out of town. She cheated on him with his best friend.
Wow....
The first two are unforgivable and he should have dropped her like a bad habit a long time ago.