I'm sorry you're going through this, the worry must be overwhelming. I wonder is it worse having them far away, wondering what could happen to them, or them in the same household plucking your last nerve almost everytime you see them and knowing you're always coming home to that?
My brother's been in rehabs before, but always relapsed not long after being out. It's hard to believe he keeps relapsing, even though he winds up miserable and told that his liver really can't take more relapses.....3 relapses ago! Hang in there! Thoughts and prayers to you.