Gfs crazy family

Essentially , by Saturday my gf (22, and I (25) are getting thrown to the street. I know what everyone will think. “Well what did you do?” Well I called her dad out. He’s abusive. He neglects her. Doesn’t feed her. Will make dinner and not tell her but will tell her other kids. Tried having a civil talk with her parents and her dad went to 100 real quick. Told me he’d kill me multiple times. And then here is the real kicker. Her 450 pound hippo of a brother has asked her to cuddle and said “she didn’t have to be naked” he asked her to make an only fans and he can “film” different positions. On top of that. One night she got drunk. Went to the bathroom to puke. ( the most comfy place after throwing up). She woke up with her pants off, and her seal of a brother jerking off right next to her. Breathing hard. I have proof. Of all of this. The dad called the cops on me for calling out the situation and had me trespassed and Is kicking her out. He told me he’d kill like 5 times. (Which I really wish he’d try. I’m a trained Muay Thai/bjj cage fighter) What should I do? Would ibtah if I went in and like told on all Of them? I even told her mom. Multiple times. She ignored me. It just makes me so mad. She’s looking for work and my job is slowing down so I’m looking for a job but rn we only enough money for a crappy camper to fix up. Probably not one to drive. While he gets showered in ps5s. Oculus’s. Anything he wants. He has 4 24 packs of mountain due in his room. Don’t really know what to do. I want her dad and brother to rot, hell Even her mom did neglecting her daughter to cater to her hippo of a son. He’s never kept a job longer than a week. I’ve caught him sitting there beating to me and my girl getting intimidate. It just sucks. We’re about to be thrown the street and she’s so sweet. But her brother. The one who assaults her. Who has done things that would get him jumped, gets to just stay and “win” I have no issue giving his name out. He’s a compulsive liar and a pig and will always be stuck a virgin so he thought maybe his sister is a good first time. She doesn’t know if he did. She just felt him beating it and being right on Top of her. Wibtah If I beat him to a pulp. Same with ber scaredy cat dad( he told the cop he feels terrified with me around” ( when he told me he’d kill me multiple times) when all me n her do is lay in her bed . We’ve drug tested for them and passed.. idk what to do.