It makes you wonder how you survivied the first round. Once the chaos has been removed and you find there can be peace in the household it makes you wonder how you got through it the other times. I agree with Cynical One that there must be other places he can stay.
I had invited my AD over for Thanksgiving. She chose not to come. It was the first time in my life she hadn't been at the table with us and it was the most enjoyable holiday the family has had in a long time. We didn't have to hide our belongings, put up with her snide remarks, or walk on eggshells afraid to offend her. I've decided not to invite her to Christmas, and the family would prefer her not to come. If she does show up, hopefully we can abide by some ground rules, which I doubt. She makes it so hard.
Sorry you have to go through this. Lots of hugs and prayers that the six weeks fly by.