Sometimes we feel like we hate our siblings. Sibling rivalry is part of the natural world. .As embryonic sharks grow in their mother’s womb, the biggest baby devours the rest of the young to make sure he or she has enough to eat. The first-hatched eaglet slays all new hatchlings by pushing them out of the nest, receiving all the food brought by parents, ensuring his survival.
It is part of our culture. The first recorded murder in history, the Bible tells us, was Cain killing his brother Abel. We all know the blood and gore of myths, fables and even new stories chronicling sibling rivalry.