<human>: Give me the gist of the text in a nutshell

Hey Reddit. I need advice.

As the title suggests, my mother has become an alcoholic. I'm familiar with the symptoms and she has them all. Blacks out, remains drunk for several days in a row, misses work, drinks at work, etc. Her personality also makes it incredibly difficult to get through to her. She's very sarcastic, defensive, has a very illogical thought process, melodramatic, externalizes all blame, and probably the worst one, she's very authoritarian so everything is her way or the highway. Hence everyone else is always wrong.

While her self-destruction certainly bothers me, my real issue is my 12 year old brother who lives with her and her shitty boyfriend who only ever adds insult to injury. My bro's dad loves him very much but is quite irresponsible, financially unstable, a pathological liar, etc. In other words, he's got his own set of issues, too. So if possible, I wouldn't want him to live with him.

My sister and I are 26 and 23 respectively, and truthfully I'm in the most stable situation out of the two of us. Still (if legally possible), I can't take care of him till at least next year.

My mom, bro, and sis are coming into town this weekend and I was thinking about doing some sort of an intervention. I'm not sure it'll work considering how my mother is, but I have no better ideas. Anyone know the right way to do an intervention, especially considering the personality type I described for my mother?
<bot>: My 12 yr old brother lives with my alcoholic mom. Anyone know how to do an intervention so I can get her functional again?