I have a brother who is currently in jail for attempted to rape our late mother. He suffer from delusions, paranoia, strange behavior. He has no job, no friends. Our mother was taking care of him last year, and last April he became convinced that she was responsible for all his misfortunate & decided to teach her a lesson.He was diagnosed with schizophrenia. I feel disturbed, and if my mother is still around I feel like doing the same thing to her. Is it normal to think like that?