There is a strong genetic link to some forms of schizophrenia and bipolar 1 disorder with psychosis. I come from several generations of schizophrenia. I had my first psychotic manic episode at 16 after the sudden death of my cousin, the one person I trusted, went to school with, and shared lots of time with. His death destroyed me. It triggered my BP1 psychosis disorder, but I was predisposed to it to begin with. Hard to say, if it hadn't been his death if it would have been some other stressful event.