That's awful. In my opinion, which I cannot prove, your brother is essentially following a program that he cannot divert from. Your brother that you love is still in there somewhere, but whether its a parasite, an invasive demon/soul, or being connected to a different collective conscious, he CANNOT see past this. I wish you peace and hope he/they will come back to you. There are many, many, many on the other side of this issue that are hoping that WE come back to THEM. Something supernatural and spiritual is going on. Not sure if this makes things better or worse for you, but I figured I'd throw it out there. Be well.