AIO for cutting off my alcoholic brother?

My (24F) brother (27M) has fallen into alcoholism at the beginning of this year. He attempted suicide shortly after, and has finally been attending a daily inpatient program. My parents and him thought he only needed therapy once a week, but I pushed and found him a program he likes.

Prior to this, my brother got involved with a girl at work who was all bad news. He ended up losing his job because he was unprofessional with her in the workplace. Important context is my cousin got him this job. For months, my brother has nonstop been reliant on my cousin as a therapist and a lifeline. My cousins wedding rolls explicitly told my brother that if he doesn’t get help for his alcoholism, he will not be able to come to the wedding. After that, my cousin blocked him.

My cousins wedding rolls around and the invites go out. My family receives an invitation that says to the [insert last name] here. When my Mom finally decided to RSVP, my brother wasn’t listed on the website and my Mom lost her mind. She called all of my aunts and uncles and grandparents cussing them out and saying horrible things to them that I don’t want to repeat.

For some reason, she is under the impression that it was a secret group decision to not invite my brother when my aunt (mother of the groom) told me that she herself didn’t know about his un-invitation. Neither did anyone else.

Since then, my Mom and brother have refused to talk to any of the family. I have tried to be neutral in the situation because I understand why both sides are hurting. My brother was uninvited, and my cousin got put into a role he didn’t ask for.

Anyways, I have also tried to be very supportive. I answer my brother whenever he calls. After his attempt, I called the police and had an ambulance sent to his address to go pick him up. He’s screamed at me, called me names, threatened me if I were to attend the wedding, etc. My mom and brother came to pick me up for lunch a month ago and took my phone from me and locked the car doors until I would talk to them about the wedding and justify my reasons for attending.

My brother continues to text my extended family and call them names for supporting my cousin, when in reality they haven’t “supported” the decision, but more-so just attended the wedding.

For example, my brother texted my 84-year-old grandmother and asked why she didn’t stick up for him. She replied saying you know I love you. Are you talking to your therapist about this? My brother lost his mind and said unkind things to her. My Mom told me that my grandmother should have said I love you, how are you? I’ve missed you.

My Mom constantly tells me I don’t understand no matter how I try to help.

Last night, I lost it. I screamed at my Mom for texting such unkind things to the rest of the family, for telling me I never understand, and for never acknowledging how much I have been hurting throughout the past few months. I let it all out. Some things I said: “Why is [brother] able to get away with saying terrible things to everyone?” “Nobody ever checks in on me.” “You’re setting a terrible example for [brother] by also spam texting verbally abusive messages to the family.” “You enable him.”

My brother texted me and told me to never come home again or speak to him, so I blocked him.

AIO?