I would Make him leave. I own the house. In fact, I own almost everything in the house except his crappy car, his clothes and his capacious duffle bag.
I have made up my mind. I told my mother all of what has been happening lately and told her that I am not going to make any decisions before the holidays unless he goes into total meltdown. He has been sober two days now. I don't expect that to last but I might be pleasantly shocked. If after Christmas he is still not sticking with a program he will have to move out. The tax return will give me enough to give him some rent money even though I don't have to. However, it would be hurtful to the kids if their father was homeless.