Hmmm... You'd think if his mother had Apollo's genes, she'd be able to run from a rapist. Maybe he got her while she was sleeping...
I think you could make something up. Going back far enough, with the level that "science" was at, people really believed what is today considered mythology. Then, it was very real and they lived it every day. Critters and beings of all kinds were all over the place- the fact that they never saw them just proved they had magic and mystical powers. Often times, people just saw what they wanted to; sailors seeing walruses and thinking they were mermaids, for instance (they liked their women much bigger back then, anyway). People used to leave leftovers on the back steps for the faeries. When the food was gone in the morning, that just proved their existance. There were examples of intermixing that I don't remember the names of, but there was the half man/half horse, for instance, and satirs. Some little tweak like an extra vertibrae at the bottom of the spinal column that, centuries ago, was the beginning of a tail, but is now a vestigial leftover that makes it more comfortable to ride a motorcycle rather than a car (especially sports cars with out all the seat padding.
OK. A little water in the face helped. maybe i went off in the wrong direction?