· They fight because they want parent’s attention, and the parents has only so much time, attention and patience to give
· They fight because they are jealous: “He got a new bike. I didn’t. They must love him more than they love me.”
· They fight over ordinary teasing which is a way of testing the effects of behaviour and words on another person” “He called me first…” “But she called me first”
· They fight because they are growing up in competitive society that teaches them to win is to be better: “I saw it first.” “I beat you to the water.”