what can I do when I have a witness to coercion to get my 100% disabled father to nod his head to remove me from my inheritance?

What can I do when I have a witness to coercion, (my father’s caretaker) to get my 100% disabled father to nod his head to remove me from my inheritance, in my fathers will, drawn up by my father’s friend, whom is a lawyer, by having another attorney, referred by my father’s attorney, draw up a new will that excludes me. My father has a very handsome estate, and I was to benefit very well. My father’s wife never wanted me to be in the will to begin with, and she waited until he was totally disabled, and convinced him to change the arrangements he had for me. To do this, she was yelling at him, and him already being sick with Parkinson’s, drove him to drown himself. Then, hospitalized for about a year. After doctors released him, instead of sticking him into a hospice, she brought him home, and hired a few caretakers, with my father’s money, one of which is a family friend, who has witnessed numerous unethical, dishonest acts toward my father. I live out of town, and I, am also disabled