Please give me some advice!

LONG STORY WARNING ( I’m posting Anonymous for family safety)

I have a brother who has two children with his girlfriend. Ages three and one. He’s a girlfriend convinced him to move away from us and two years ago in hope that moving closer to her mother could help with her addiction to alcohol … lately things have not been good between them because of her drinking and wildness. She is also doing all sorts of drugs..She has damaged two different cars with the kids inside because she was drunk driving. My brother don’t get to see the kids much bc he doesn’t want to deal with his girlfriend.. but I said what about your kids safety!! They are both very immature and have a lot of growing up to do and both need to get their priorities straight. They live in Florida.. my brother lives alone and she moved in with her mom and the moms boyfriend.. none of which is a good environment for my niece and nephew. I’m heartbroken over this.. he has recently blocked me because I speak the truth and he doesn’t want to hear it. She showed up Halloween with the kids completely drunk.. they got into a fight and both kids were crying so loudly the neighbor took them inside until they were done arguing. The cops have not been involved with any of this…

My brother doesn’t drink or do drugs. He really is a great father and He need to get though kids out of her care( if that what you wanna call it) I need some advice on how I can get those kids out of this mess.. I fear for their safety.. I don’t want them to be handed over to cps. I want them to move back to PA and be taken care of the way a 3 and 1 year old are suppose to be taken care of. Please someone help… what can I do?