I'm rather glad the boy is reading the books because it means I get an idea of what's in them and whether or not I'd like them ahead of time. And when he does come up with some of his Riordan based stuff, I can counter with some of the original classical work.

And I LOVE myths. Grew up on 'em, still read them and just finished the Fontenrose books on Delphi for the sake of my NaNoWriMo. That was the one that really pointed up the sheer tangled nature of myth and why they aren't exactly like stories. (Though our stories may well be future myth and for the same reason.)

Oh, yes, and Demeter's power is definitely NOT something to screw with. Hades was really pushing his luck with Persephone. Four months of dry sere weather was getting off easy. (Or winter, if you're in a more northern climate.)