Dad died a couple of years ago, he was in hospital for 17 days after a stroke and my sister and I spent most of the time in the hospital. During this time she was extremely verbally abusive to me including following me into the toilets to tell me that I was only fake grieving, and telling a nurse that I was a trained actress and to ignore my crocodile tears. I did not respond in kind and asked her to stop speaking to me. My parents were divorced but mum rang my husband in Scotland to tell him to get me to leave the hospital and go home to mind our child. My DH told her that his mum and him were coping fine and that it was important to me to stay by my dad's sickbed. I did not ask my mother why she did this at the time due to avoiding conflict because of grief. Due to covid, I didn't visit my mother or sister so I never got the chance to confront them about their behaviour. I was at a family wedding in June and my sister was there, she ignored me, (pretty sure she asked to be sat away from me) and she verbally attacked me in the garden (out of earshot of everyone). She is normally an unemotional person with a job in statistics so she's very logical. But she cannot contain her anger around me and I don't see this ever changing. I have asked her to think about her rage towards me and put her thoughts in writing and I will respond. She didn't. I believe there is no going back. I don't want the stress of dealing with her when mum gets ill. So I want to make it official that we are no longer siblings and am going to a solicitor to find out how to do this as I don't think my mental health can take her insane rants at me any longer. AITA for doing this?