The thing is that there won't be yelling or name calling; there never has been. The motivation for change is not there, however, since his mom is now available to leech onto instead. His 36-year old sister has recently been weaned.
I am meeting with our counselor tomorrow. I called her this morning after this all fell apart; we knew that "Plan B" as she calls it was always a possibility. She says that she's in my corner, which helps. She has been able to see through a lot of his bs in our sessions, and he is very good at the bs.