Dad’s mentally abusive wife puts lies into dad’s head about me so he won’t speak to me. Isn't that wrong? It has been 6 months!

When he finally wanted to talk to me she took his cell phone from him. Over a month went by and I bought him one. The next day she must have taken it. There was only one day of activity on it. She’s his POA. Can she just keep lying like that and get away with it? My dad once told me he had a trust for me in his will. I do have a disability. Now I don’t know. My dad gave my other sister a number to call for a copy and he said his wife was POA and ask her but we know how she is. In 1984 when her 1st husband died, her own son took her to court for forging the will. She got off. She use to be a court reporter. When my dad spoke to me a 2nd time she stopped her visits to him. He has been in a nursing home several months now. Before he was in the hospital and Rehab.. Is this misconduct on her part? What can i do? I love my father so much and we were the closest ever and now this is torture to me.