Troll larvae are tended to communally by the Auxilliatrices of the brooding caverns, and turned over to the custody of their lusus naturae guardians somewhere around their primary metamorphosis. Most of us never meet a close genetic relative, or at least not close enough to be positively identified as such.

"Parents" [And that's a mostly-successful attempt at repeating the word he'd used,] doesn't really translate.