I am so deeply sorry that you had to go through that. I hope that you have been able to find some helpful treatment to deal with the trauma.

What kind of specific consequences do you worry about if you told your dad? This is the kind of thing that it is hard to give advice on because you know your family best and would have the most insight into whether your father would behave in an inappropriate or cruel way. If you think he can be reasonable about it, it probably would be helpful to explain what happened. You certainly haven't done anything wrong here.

Good luck with whatever you decide.

EJ