Hello, I'm Aimee and am the wife of an alcoholic/drug addict. My husband has shown me over and over that he is not going to listen to anything I say, so I have given up trying. Letting go is definitely hard to do, but we have to. I am still learning that. I would say that you would be overstepping your boundaries by trying to get your sister to move back home with your parents. That is going to do nothing sadly. She is going to have to hit rock bottom, whatever that may be. My husband goes into rehab in the morning and I pray that he becomes a recovered alcoholic/addict, but I'm not holding my breath. I know it hurts..it hurts more than many things to see a loved one do this to themselves, but in my short time of being here, I have learned that it is up to them to recover, and nothing we can do, sadly, can make them change. I'm sorry my reply isn't very positive sounding..keep praying and big hugs!!