I do not have much to offer regarding your mother and sister that others on this thread haven't already mentioned.
I will say that when I was younger I, too, had a terrible anger problem. I started trying to find creative ways to get the anger out without hurting anyone.
My favorite involved the giant set of encyclopedias in the hallway, outside of everyone's bedrooms. When I got mad at someone I would shut their bedroom door, then throw the A, M, and N volumes at the door. I would then tell myself that I just sent the entire Air Force, Army, Marines, and Navy after them, so I didn't have to worry about it anymore, the problem would be taken care of. When I was especially angry I would also add in the G volume ("Government, United States").
It seems crazy now, but it helped a lot back then. (Although I am sure my father wondered why he had to repaint those doors once a year.)
Perhaps you can find something crazily creative that helps you.