The Angel Factory, by Terence Blacker
Protagonist discovers his parents are aliens
(Review posted 6 Jun 2004 18:05:11)

Two nice things about young adult fiction: [1] their authors are less inhibited about their basic premises (since kids, even more than say SF fans, are assumed to have wild and accepting imaginations), and [2] they're short.

So this kid finds out that his parents are actually aliens, who are beneficient but in a sort of creepy paternalistic way, and has to choose whether or not humanity should be allowed to make its own way in the universe. Roughly. Nothing breathtaking or utterly unique, but a good read even for a grownup (see paragraph 1).