Well then... I'm no expert on genetics, but it stands to reason that you've got to be part vampire! Humans and magical creatures fall in love with each other all the time, so someone like you was bound to show up one of these days.

[ Just how much of the kid is human, anyway? If both of his parents are... ]

...One of them could be half, maybe. Or maybe one of your grandparents... How many greats did you say were in that great-great something grandpa?