Kat I have read and reread all of your posts. I thought a lot about it and did not want to post on this one. But I decided I would be remiss if I did not. I have been an Officer for twenty four years. I have dealt with people like this many times over the years. I am just going to say it. Your sister needs to get out and get away! no good will ever come of this. The only outcome possibile is heartache, pain and worst of all death. He will suck her into the vortex of hell. She needs a clean and totall break from him and now not later. I apologize for the direct cold tone of this post but you have a loving caring family, that's a treasure you need to take care of.
I truly wish you the best!
Darrel.