Jacen | Kol
Your brother? He's a sociopath. That's obvious to anyone with a brain.
But the rest of you, you're hardly shining beacons of sanity. I mean, neither am I so I feel no hesitation in saying so. You all resent him and band together against him, are you saying the three of you don't have things between you you just don't talk about?
Honest opinion... Talk it out, or spend some time being individuals. I'm not saying walk away like he did, but focus on yourselves, on whats going on with all three of you. It can't hurt.