I think it is a conflict of interest no matter how he is. Either he is going to be lenient with you because you are his son or he is going to make it especially hard on you because he needs to prove that he isn't favoring you. Either way that is bad for you.
My mother was a teacher for 43 years, and she made a point of always knowing my teachers personally. They often were harder on me out of professional courtesy to her. So as another poster observed, sounds your father being teacher might make things tougher for YOU, not the other kids.
It sounds like your question should read: Do you think its fair to me instead of "to the other students in my class, if my dad is the teacher?"
i think it's nothing to do with fairness because it's not like he is giving you answers, teachers tend to be very hard on their kids, my friend's mother is a teacher and i felt sorry for him because the woman didn't accept Bs
hey, tell your dad you want to play it fair and that in school you dont want any extra special treatment or whatever. i have known two girls whose mothers taught their class. totally fair manner. you study on your own and make him proud. no taking advantage. your friends/ classmates will ignore/ avoid you otherwise.