My Father Is Blaming Me, His Adult Child, Of Ruining His Marriage

My father (55) and his soon-to-be ex-wife (34) are blaming me (31) for their marriage falling apart.

I have limited contact with my father already due to my unwillingness to forgive him for his abusive behavior towards me, my mother and my siblings when I was a child. She seemed to notice me not being around.

He asked me to befriend her since we were close in age, and she moved here (SC, USA) to be with him. I agreed to talk to her.

They started hitting a rocky patch about a year ago. He complained to me about their issues and I advised him to either get therapy or divorce. He declined both.

She and I shared at most 5 conversations. In one of these talks, she told me he was abusive towards her and the children. My sister and I comforted her and, with an aim to be sympathetic, told her about our childhood abuse. I did encourage her to leave him for her and her children's safety.

Fast forward to now; she's left him and claims to have recorded the conversation my sister and I had with her about our abuse and is using it in court. She, according to him, says their marriage fell apart due to me and wants me, my sister, and my brothers, dead. I don't want my trauma paraded out in court without my consent. I don't regret being sympathetic towards her if he was indeed being abusive towards her and the children, but I don't want trauma to be used.

My father called me and ranted, telling me how it was my fault, to think of the children, and I would be going to court. Saying I need to swear to him about this and that. Also, how dare I!?! I told him there were 2 people in his marriage, and I wasn't one of them, and therefore not involved in their marriage and I wanted no part in their divorce.

My question is this; are they able to subpoena me in a divorce? I don't want to be involved in this at all.