The Moriarty-child did all this just to mess with you.
It really isn't hard to guess. Unless there was a plot twist. Which was kind of to be expected.
I feel bad about not knowing who Moriarty is..... I haven't read many older books....
@Hydra, he's a villain from Sherlock Holmes. Kind of THE villain.
But hey, where did Moriarty-kid actually guess their sire? He identified them by name, but not Jekyll and Hyde.
@AcolyteofDaniel: I believe he didn't guess their sire on purpose because his boss was coming anyway. He won by buying time more than actually winning, kinda Win/Win for him.