I am reminded of friends of ours whose kids were growing up in a very French part of Quebec. They spoke English at home, and would often have friends from out of town over to visit. Their kids were very bilingual – speaking French at Daycare and then at school. The kids had somehow internalized this to mean that kids spoke French and adults spoke English! When on vacation in a different province, they would start to play with other kids and would speak French until they realized that the other kids had no clue what they were saying … then they’d switch to English … It is just funny how kids learn to associate language in totally different ways than we do …