My(32M) older brother (35) developed some sorts of severe mental health issues back in Middle school when he started becoming very angry and very violent. Physical bullying was one thing, but he tortured me psychologically too. Ex: one school night at about 11pm, he came into my room asking that I apologize for causing WWI. I told him he's stupid and to leave. Cue pinning me to the floor and spitting on me, squeezing the air out of me for extended periods of time, farting then holding my mouth shut and hitting me just not-hard-enough to leave marks. I caved at 3am.

As a result of my special needs and social anxiety making me feel outcast at school, paired with his terrorizing, I was near-suicidally depressed.

At one really low point, I cut my arm some. His reaction: "you idiot, you want pain? I'll give it to you", punching my face numerous times. My parents, WASP-y old Southerners that they are, did pretty much nothing about it. They hardly even acknowledged my depression much less tried to get him to therapy or anything.

College took him across the country, and I had never felt freer. When he left we just didn't talk at all; I did visit him once, and he got belligerently drunk and ruined it.

He did so much drugs at college, I think it broke his already fragile mind. He is now a pathological liar on top of narcissist and addict, is late for pretty much everything, and is just constantly a stick-in-the-mud if not full on dickhead, even to our parents who have basically saved his life if not kept him off the streets given his track record.

Once or twice he has "apologized" to me drunkenly, yet still does next to nothing brotherly/friendly. my parents still enable him and sort of blame our lack of relationship on me; they only know the tip of the iceberg that is his and mine's past. The times I extended an olive branch, he burned me; getting shitfaced at my parties and insulting my friends, doing paid "housesitting" for me yet stealing my anxiety medication and drinking a bottle and a half of liquor in TWO DAYS. Even less-serious things like just trying to converse with him go nowhere.

He's only included in my groomsmen since he's blood. At my recent suit fitting that I scheduled around his work, he was not only late but rude to my friends yet again. Small talk and not looking like he wants to strangle you are things he's not willing to do for his "baby brother", during one of the most important times of my life.

The bachelor weekend is coming up, and I might end up using his more-than-likely fuckery as impetus to un-groomsmen him. I have struggled thru my own mental health so there's 0 excuse for him not doing the same and growing the fuck up. If he did mess up my wedding day somehow, I would cut him out of my life. I would rather him fuck up a private weekend that isn't nearly as expensive or attended as our wedding will be.

WIBTA for finally giving up on him if he screws this up?