well, I used to have nightmares about my Dad sometimes when I was little. I guess I was slightly scared of him at times. He was usually more strict, and less understanding than my mom, and sometimes he got really mad about small things. But he was never a bad Dad. And if I told him, he would be really sorry and worried and say he never wanted me to be scared of him. I don't have nightmares about him any more. Have you been getting along with your Dad lately? Does he ever scare you? Because if so, maybe you should talk to him and work things out. Your stress may be affecting your dreams.
Is he dead? After my mother died, who I loved dearly, I kept having nightmares of us fighting. I was always yelling at her. I couldn't understand it. I do now. If you keep having them, please see a therapist and discuss them. Your subconscious could be telling you something and you may need someone to turn to that's not family. I hope it's just random dreams. But keep that in mind if it continues.