I don't see that as a valid 'excuse' for him: there's plenty of books aimed at children, and he could've read one of them himself once he knew he had a daughter. As soon as you know that you've sprogged a female, you know that you're going to have to answer questions at some point.

It's not as if your father has the excuse of being some uneducated yokel. The dude can read as well as the next PhD.