One of my brothers is an alchoholic and a drug abuser (addictive behaviors run rampant on both sides of his family tree, he got a double whammy), and I'd let him sleep on my couch in a heartbeat IF he agreed to not use drugs or drink while staying under my roof.

You have your sanity and your kids to protect. Decide what you can live with and what you can't and then do it. You are a strong, courageous, feisty woman. You can handle this. I believe in you.
______

May The Hair On Your Toes Never Fall Out

--Traditional Hobbit Blessing