I have caught her arguing with people who were not there countless times. She has extreme mood swings. She has, at some point, abused every member of her family, though recently she has only been violent with my father (still legally married) and her pets. I have no proof of any of this, and, as she "doesn't believe in psychology," has never seen a professional or been diagnosed with any mental condition. All her children are adults. Is there anything my father, sister, and I can do?