@bendmeoverbackwards your situation reminds me of a colleague who couldn't get her 20 something daughter out of the house
The daughter used to shout at her parents and siblings to the point that you could hear her screaming at them when you were halfway up the road. That's the only reason the colleague told me. We were meeting at her house and she ended up having to tell me. I almost walked in and said "oh my God, someone in your road is having a terrible domestic". It was really shocking to walk that distance and realise I was stopping at the house where the noise was coming from!
It was a huge mission of family therapy, paying her rent to go and live somewhere else, and eventually refusing to let her in except for Sunday lunch
I'm no longer in touch, so I hope it turned out nicely but I feel like the daughter ran through so many ways to legitimise her behaviour, ultimately she had to learn that people weren't going to put up with it.
in the family therapy session, she did end up admitting that she didn't want to leave the family home, didn't want to get a job, and just wanted to stay at home with mum and dad and the dog.
I think the fact that her siblings were growing up to do the usual things was probably helpful. It was an absolute nightmare period for my colleague so I really hope it passed.