I'm sorry to ask this here. I know that it isn't the appropriate forum, but I can't find anybody to ask and I'm worried about his and my parents' health.
Basically? He's losing the plot, thinks that everyone is out to poison him and says he's going to buy "chemicals" online and poison people who he thinks are conspiring against him. He's also accused mum of somehow colluding with them to poison him. Thinks that everyone is moving his stuff and trying to make him think he's gone paranoid. Won't eat or drink anything that anyone else has prepared or that has left his sight at all. My parents are afraid to go to sleep for fear of what he might do. For the record, he's 24, and I've told them that they should kick him out and/or call the police, but they won't. I don't think that he's in his right mind. He genuinely believes that everybody is conspiring against him and he acts accordingly. And I don't WANT them to kick him out, but at this point I don't feel like anything else is working for them. Really, he needs to be in some sort of psychiatric care, but if you look around there aren't any contacts for that sort of thing.