Venting

(SORRY THIS IS SO LONG)

So my fiance's brother is an alcoholic. There's no sugar coating it or anything else. Hes basically a man child. He likes to joke around, but the problem with that is he doesn't know when to QUIT, and usually I end up hurt one way or another when I'm around him. I adore him most of the time, hes like the big brother I always wanted, but hes too much at times also. Around the 4th of July last year he got some of those snapper things that you throw at the ground and they make a loud popping sound, only not the little ones the mega ones? We had my fiance's niece staying with us that weekend. His brother invited us over to their house to play games. We are having a good time, he was drinking but he hadn't done anything childish. About 20 minutes before we were going to leave, he pulls these things out and acted like he was going to throw it at me. I told him not to, he didnt listen. He threw it at me, it hit the table in front of my face, stuff hit me in the face from it. I don't think I've ever been so pissed in MY LIFE. It could have gotten in my eye, and to top it off emma was sitting across from me, she's 14, and it could have hit her! I lost my mind. Literally was going to beat his ass, but my fiance made me leave before that happened. It was just too far. Anyways. I'm now 15 weeks pregnant and I've made it very clear to my fiance that I don't want to be around his brother when hes drinking. I don't mind hanging out but that is my ONE rule. His brothers birthday is coming up, and mine is shortly after, so we were discussing going to dinner for both of our birthdays. His gf, who up until recently I really liked and considered a friend, decided she wanted to go to the brew house for his birthday. I guess its beer or something, so I messaged her on snapchat and told her politely that I don't want to be around him and alcohol, trying not to piss him off. I thought she and I could discuss and see if we could come up with a plan that didnt involve it. She showed him, he messages me pissed off. And it's just a shit show now. Mind you, he got super drunk one night, tried kicking her out of the house she owns, she called my fiance who's a cop, and had the cops come to her house because she was scared of what he might do while he was that drunk. He screams at her and accuses her of cheating when hes that bad, he drives drunk, he drove drunk that night and nearly wrecked his truck. She always says she's going to break up with him and then never does it, and I've stopped talking to her about him because she says one thing and does another every time and I'm tired of listening to her. Then yesterday morning she snaps me "I told him he needs to move out" like we're going to be all buddy buddy because she's supposedly kicking him out. And I wrong to be irritated?! I'm trying to do what's best for me, and my unborn child, and it's so hard.