Another option, but only if you feel comfortable with it, is to say so long as you are clean/being treated (after rehab) you can stay here while you get on your feet.

Be sure to explain to your kids that none of us can save someone who does not want to fix herself. We have to save ourselves and create safe environments. It is important for your kids to know this is actually the kindest thing to do for her as otherwise she destroys more lives. If she continues to spiral in your home, she ruins her own life, yours and your kids.’

Enabling does not equate to fixing.

You can do this!

Me 41, H 47, M 15 yrs, S11, S13
BD 1: 11/4/14 we work on it; really I pretzel myself
BD 2: 3/31/15 H goes down to "dorm room"
8/15: H back to MBR
10/15: H back in dorm room
1/18: H files, now divorced