I've name changed as I am prepared for a flaming and the situation could out me.
My sister is mid twenties, has 3 children 8,6,4 and is 6 months pregnant with number 4.
She has been with her husband for 9 years. He doesn't work, is an alcoholic, addicted to weed, gambling addict who is incredibly emotional abusive to her and the kids and very very selfish.
He has done numerous things over the years, cheated her continuously (once giving her a sti and once the ow started to stalk my sister and the kids) smashes up the house on average once a month, disappears for days on end. Never changed a nappy, fed his kids, spent any money on them, got up in the night, doesn't come to family get togethers, Has been arrested on 4 occasions, had fights outside the house, had people turn up in the middle of the night to 'get' him.....I could go on and on.
Last night he had a row with a friend, who then shot him in the hand with a shotgun
major police involvement they both have been arrested my sister was asked to leave with te kids so they could search the house etc etc. they have already found weapons.
She still defends him, it's not his fault he's just a victim blah blah blah, but now she is staying at our parents house......this is my AIBU thanks if you've got this far....
As her and her 4 kids are staying my DS can't stay round and I have to go to work. My DM and DF are stressed beyond belief.
I am just sooooooo fucked off with all this! It's been 9 years of this shit! Everyone's lives get upturned because of his stupid actions but it's just swept under the carpet, my parents don't say anything to her for some unknown reason.
I've just had a row with my DM about what am i meant to do with DS, if this was the first time then It wouldn't be an issue but it's about the 20th!!! My DM lost her rag and now it's all my fault coz I'm an aggressive selfish bully......coz I want to go to work
and I tell my sister to Buck her ideas up, stop getting pregnant and kick him out. I feel for my DM and DF having to deal with this but they have always been so passive and swept it under the rug in case she stops them seeing her kids.
AIBU for being incredibly fucked off at this stupid man?? For making my day really stressful (selfish I know
) And telling my sister to grow up and think about her kids?
I'm just furious for the kids really, IMO she doesn't think of them at all. She has all the support in the world if she wanted to leave him, neither of them work and are in social housing so that's not even an issue.
Ahhhhh it feels so good to get that out. Sorry for the rant 
What can I do/say in this situation??