I noticed Littlefoot never really introduced his friends to Bron, nor Bron to them. Cera, Ducky, Spike and Petrie just seemed to understand he'd found his long-lost dad and didn't ask anything about it. For someone living outside the great valley, Bron didn't seem all that surprised that Littlefoot had other kinds of dinosaurs for friends. Oh, and from what I've heard he doesn't even seem to acklowledge Chomper's existence when he appears in the TV series. What's with that?