The document discusses the vengeful sibling archetype through various examples from literature and mythology. It describes stories like Cain and Abel from the Bible, where Cain kills his brother Abel out of jealousy. It also mentions John Steinbeck's East of Eden, which parallels the biblical story of Caleb resenting his brother Aaron. Finally, it summarizes tales like Sundiata where a sibling is forced out of power by a rival brother or stepmother.