Hi, Donutady, and welcome to Psych Central! Since he's become a danger to himself or others, then you can have him put in a mental hospital. But nobody will be able to get him out of his delusions.

I'm so sorry he's this way.

Meanwhile, since you're 18, you can seek help for yourself. Do you have any personal money? A job?

Please don't let his problems get you down. If I were you, I'd stay away from him as much as possible .