For part of the school year there were 6 girls in my grade. One of the girl's parents were divorced. She spent 6 months with one parent and the other 6 months with the other. We were in the second grade.
As I look back at that time I wonder about the dynamics of it. Always two of us were "out". We were not included in any games. we were not allowed to sit with them. We were completely shunned. It was horrible to be one of the two. And it hurt our feelings.
Then suddenly we would be welcomed into the group. Two different girls were "out". We were just as cruel as they had previously been to us.
It was not the same girls any of the times. We each had our turns on both sides. And believe it or not other than this behavior we were all nice girls. Why did we do this?