I ask because DD's are still only 6 and 3. Whenever I've gone in as a parent helper, I've noticed that, bar one or two pupils, everyone is really amiable and 'easy' with one another. No sniping etc.
I've also been working in a different primary school, and it's the same atmosphere in the younger classes, but in the Juniors, there starts The Divide. Mostly girls too, I may add. Groups form, power levels are asserted, quiet one's (especially one or two with ALN's - as in the case of the school where I'm working) are flying solo. Sit alone, work alone.
So I anticipate, with some anxiety, this Divide happening with my DD's. When does it start happening?