Elderly, insecure, narcissist mother showing psychosis after encouraging golden boy son to commit suicide. I need help. Advice?

Having just got through a Dark Night of the Soul of epic proportions as my childhood abuse / adult traumas came up, my husband's mask dropped to unanticipated depths of marital & financial abuse...... as my brother simultaneously started to crash, then I went over a cliff in my van ..... and eventually my brother committed suicide. I was in therapy told No Contact.... as my family imploded within a year.

My mother and husband of the same ilk, I married my mother..... insecure narcissism is incredibly toxic.

Since this happened and especially my brother's death, to which she blurted out to me, she encouraged him to take his life.... I see a sort of psychosis as she lashes out even more. I am low contact as she and my dad in their late 80's. I am worried for my dad....and for my well being, as I was always the scapegoat, and I really want nothing to do with her, but of course being an empath..... I struggle to be compassionate while putting up boundaries.

Since my brother died in Dec 2019 .... I have hardly seen them, they never ask about my feeling about my brother's death and my mother's insane admission..... sos