I've been looking into and reading all about martial arts latly and I plan on taking jiu jitsu once I've learned a little more about it. My big brother who is around 250 lbs. , a violent drunk, and a good fighter, wants me to teach him what I learn. This guy flys off the handle over nothing sometimes, and if i tell him I'm not gonna teach him jack he'll prolly fly off the handle about that too, if i teach him one of the main purposes of my learning self defense will be in vain. what can i do to avoid these sort of conflicts with him. btw, he's the type who feels he has to be the alpha male all the time as well.....