There may have been a thread like this somewhere. I'm not sure.
It seems to be a type of society where folks are allowed to speak and the majority votes on what to do, with usually the folks being split between Grandpa Longneck and Cera's dad. I don't recall where in what movie, but I recall, I think, where Littlefoot was not sure if he could speak at the meeting place, but Grandpa Longneck saying something that meant, I think, that all were welcome to speak there, so maybe kids are allowed, or ones past a certain age if allowed by one of the main 2 leaders.