My adopted brother for a very long time I’m pretty sure is dealing with mental illness. Both of his parents were diagnosed schizophrenic so there’s definitely the genetics there. Since we got out of high school a lot of him has changed a good bit in his behavior that leads me to believe that he’s struggling. Though his childhood alone is enough evidence that there is no way he isn’t dealing with severe trauma at the least. But one of the biggest things is he complete perceives conversations different then everyone else.  For some examples “ my younger nephew and him were playing around with a lighter and my sister jokingly said “ don’t listen to him he’s being a bad influence “  everyone else in the room completely heard her playful tone and laugh but come to find out later he was very pissed and hurt because he took her serious that what she said was that he’s a bad influence to her kids and was worried about her not allowing them around him and a whole slew of very paranoid stuff which was very far out, I mean he deals with the kids more then anyone. Another situation that was very recent was “ he was joking with my wife about some donuts she bought saying she chose badly and was jokingly being a jerk about them and she understood that and jokingly was like “who asked you anyways” and then my brother in law said “ don’t worry we all got love for you” jokingly consoling him” and my wife playfully said “not me btw what are you still doing here anyways “ again everyone was laughing and joking but then he ends up letting me know he felt extremely disrespected and that he’s not going to let her talk to him like that anymore. And these are just two of many many sitiuation a where he just has a very different view of things being said it’s cost him jobs and relationships are very difficult with him. I love him very much I mean he’s my brother and I truly fear for his mental health and I see the pain he feels from not connecting with people because of these reasons. But he doesn’t believe he has a mental illness( I believe a lot of the denial comes from him refusing to believe he is anything like his blood parents due to the trauma they caused him ) but I’m writing on here because I Of course am not a professional I can’t diagnose him I know that but I don’t know how to explain to him that this is not normal thinking that he has and that I truly worry about his mental health. I just want to figure out how I can really get this to him that I really think he’s mentally I’ll and should get real help for it that it would help him so much. That I’m not trying to hurt him or that I’m trying to turn him into something he’s not. So if anyone can give me some help I’d really appreciate it .