Forgive me for being cautious...I'm just not sure if this is a troll thread or not.
If it's real, here's my advice:
Sounds like your bro needs to be taught a lesson he'll never forget. This is something I came close to having to do with my brother to make him grow up. My bro is real serious, and in a wrestling match or something, he wins, but in a real fight, he'd lose. Why? Because I'm a heartless bastard when it comes to certain things, and I use strategy. If he had a knife, I'd have a baseball bat (my brother hates weapons though, so I'd just need the knife). I wouldn't rely on my weight since I can't win that way.
What you need to do is set up an encounter with your bro, but don't let him know it's a trap. You have to make the first strike, from that point on it's just a beating. You have to stay calm and collected...nerves or anger will just mess the whole thing up. Step one would be to take him out of the fight with a crowbar to the skull, step two would be to break some bones (ribcage really hurts, and legs will prevent him from walking. Once he's immobilize and hopefully unconcious, break anything he has on him (phone or whatever), if he has a car, break all the glass, slash the tires, throw his keys in a random sewer, then beat that thing so there's a lot of body work needed to be done. Most importantly though, take a marker and write real big on the hood "don't f*ck with me".
Trust me, by the time he wakes up in a hospital, the last thing he'll ever want to do again is f*ck with you. You might have some criminal charges to face, but if you're under 18 that won't be serious. From that point on, everytime you see him, remind him with intimidation. Make him think that you're totally psycho and you'll have no more issue out of him. xd I'm totally serious, it really is the only way...:/ My brother doesn't even realize how close I came to doing this to him, but the key to all of it is that first strike...and it needs to be severe enough to knock him out.
