Sibling Rivalry Sibling rivalry is one of humanity's oldest problems. One of the first stories in the Bible deals with the rivalry between two brothers, Cain and Abel. The older brother, Cain, was irritated by constantly having to help care for his younger brother, Abel, and kept asking his parents, "Am I my brother's keeper?" The story of these two brothers has a tragic ending; Cain becomes so angry that he kills Abel. The fact that it is one of the first stories in the Bible demonstrates the great importance given to the problem of sibling rivalry. By “sibling rivalry” we mean hostility between brothers and/or sisters, which results in situations ranging from common childhood childhood to more serious cases such as lifelong hatred between adult siblings. It is not difficult to find the root cause of sibling rivalry. Nature offers us many examples. In the wild, competition is usually for food. For example, when baby sharks develop in the womb of the mother shark, the larger baby shark devours all its brothers and sisters, securing all available food resources. In another example, eagles nest at great heights, in mountains or trees. The first baby eaglet that is born kills all its brother eaglets by pushing them out of the nest as they hatch from their eggs. This way all the food that mother eagle brings will be just for him. Similar competition exists between siblings in human families. However...