I don't know where else to go

Sorry if this breaks any rules, but I don't know if there are any other subreddits I can go to for advice

My brother is a type 1 diabetic, and he cannot take care of himself anymore.

He got diagnosed at 15, and had a hard time adjusting, eventually he was able to get it under control.

Around two years ago, (he's 23 now) while in DKA he suffered a seizure. Ever since then he just isn't the same anymore. In the beginning it was mild, but slowly became worse. I noticed something was wrong when he almost freaked out because I was playing a video game. He was extremely afraid for no reason and he wanted me to stop or else something bad was going to happen.

He's had delusions as well, and hallucinations. He believed he was friends with many famous people and they were talking to him in secret codes through the TV and social media.

At first he was super aggressive and broke our TV. When he drinks he basically gets even worse than usual. My sister fought him, my mom tried to stop it, and he called the cops because he believed they assaulted him. He got arrested and was Baker acted

At the psych hospital they couldn't take care of his diabetes. My mom got a lawyer and tried to sue and they let him out.

Slowly he calmed down, but he still isn't the same. He cannot take care himself and stopped going to the diabetic doctor (I forget the name.) His disability cut him off because of this, and now he has to ration out his insulin.

That is, if he even takes it in the first place.

I'm afraid my mom is neglecting him and not doing the right thing here. He looks like a skeleton. The last time he was in DKA, my mom decided not to take him to the hospital because of the Corona virus. My brother is paranoid he's going to catch it and refuses to go. He's an adult so my mom can't force him to go

He was in DKA again today, refused to go, vomited all day and my mom did nothing yet again. His blood sugar lowered to 200 and I don't know if those are safe levels or not

I don't know what to do here. My brother is going to die if this keeps happening and I'm worried for him. He doesn't have health insurance, he doesn't work, we cannot afford a caretaker to manage his diabetes for him.

The only option I can see is to declare him mentally incapable of taking care of himself, and to put him in a different psych ward. But my mom doesn't want to do that

Does anyone have any advice? Or like resources we can contact or anything?