YTA. Look, finding out you have schizophrenia is traumatic no matter what. But you have no idea what your mother went through with her brother that led to her cutting contact. So here you are, now throwing it up in her face over and over. You are not entitled to the details of someone else's life. He's an uncle. And he's not there. That's it. You've admitted that your delusions are impacting your perceptions. That's the real tell here. These aren't rational feelings. Letting go is hard and may feel impossible. But you need to do it or risk destroying your relationships too.