My heart goes out to you! My father was in a coma for 32 days. He had simple surgery, something went wrong and he basically became brain dead in a coma. My father was re-married, so my step mother was his next of kin. She called all the shots. Me and my sisters had to sit by helpless. We had no legal rights to make any medical decisions for him. It didn't seem right. We were his children, we had known him longer than his new wife. We knew better than she did what my father would have wanted. But, unfortunately, as unfair as it is, that was the law. There was nothing we could do. It is heartbreaking to sit by and have no control while someone else makes the decisions for your loved one. I know the pain you are in. Unfortunately, my step mother signed the papers to shut the life support off and my father died. Luckily, it sounds like your BF will be ok, and come home with you. I pray that happens. There is nothing you can do in the meantime. Just go visit him when you can. Take excellent care of his daughter, and pray he comes home quick. Do what you know he would want you to do. This will all be over soon and you will be able to tell him how his family acted and treated you. Maybe then you two can get married, or have papers drawn up to prevent anything like this from happening again.
Just stay away from his sisters. Concentrate on his little girl, and pray for a quick homecoming. I will pray for him too! Hang in there. Things always get worse before they get better, so hopefully this is the worst of it and better things are on the horizon. Best of luck to you and your BF.