What factions now exist within the group?

The "littluns" are simply the small children from roughly 5 to 10 years old. They inhabit a world separate from the "bigguns". They are neglected and basically keep to themselves. They play and eat fruit and go to the bathroom; that is their life. The only "biggun"to help them is, of course, Simon, "the fruit they could not reach...[and] passed them back down to the endless, outstretched hands."