As parents with young children will tell you, children often argue over possessions. Many would agree that the most popular toy in the house is the one another child is playing with. Children become frustrated because their goal - to play with a certain toy is thwarted. This space includes their possessions. When they feel this space is being intruded on, they will react in a negative way.
Children also get angry when they feel rejected or if they face verbal or physical assaults.
Young children are not good at handling conflicts. Consequently, disagreements between children often turn ugly with pushing, shoving, and nasty comments. These situations can make even the most even-tempered child angry and upset. Children also get angry when they are asked to do something they would rather not do. These requests, no matter how simple, can infringe on a child's sense of independence.