I loved my Mom, so she was Mom. Back then, he was Dad, but as an adult, I call him the Male Parental Unit (MPU). I don't think his actions give him the right to be called a Dad, daddy, or even Father. He doesn't deserve that kind of respect and to me, those terms mean someone who should love and support you. In therapy, I refer to him by his first name, but that's just for convenience.
Sage