WEll said, ZoSo.
I've spoken to his sister, and most of my family, and my preacher. No one, not one person, has disagreed with my choice. All have been loving, supportive, and have promised to be there for me.
His sister is heartbroken, but understands why, and is trying to talk him into staying with his dad, instead of couchsurfing. She's welcome to try.
I do feel relieved. As I've talked things out with loved ones, I'm strengthened that I've done the right thing. I do worry, but I don't have that cloud hanging over me... or rather, over the couch, where he usually sits. I have freedom. I have peace. And I can choose to take care of ME instead of worrying about him.
I hope he makes the right choices in the coming weeks and months. Only time will tell, and his recovery is between him and God now.