Could someone be brainwashed after an accident? I been always close to both my parents. My dad and I been very close all through my life. He would do anything for me and I for him. He enjoyed my company and his grandchildren's company. We were always tog

What . What a complex question. I can't diagnose your father's condition. After a traumatic injury like a car accident a person could develop post traumatic stress disorder, organic personality change, a traumatic brain injury or depresssion. These things can effect the ability to think and the person's behavior. It might also make the person more susceptible to another person's influence. It might be helpful for your father if he was willing, to be evaluated by a neurologist and possibly a psychiatrist.