I'm sorry. My dad and I were best friends until he died. Unfortunately he died at 57, when I was 29, but never a day went by that we didn't talk, just for the sake of sharing thoughts. Did anything happen, to change his attitude? Has he always been rude with employees? Was there a financial setback, divorce, death of someone he cared about, health issues. People rarely change suddenly and never without some precipitating factor.