How would depth psychology have evolved if Freud and Jung had used the Bible for inspiration, instead of Greek Mythology. These founders, both privileged firstborns, would have immediately discovered the central role sisters and brothers play in our social life, in our psyche and in our clinical work. Drawing on the original Hebrew text of Genesis, beginning with the primal story of Cain and Abel, this unusual book explores the tension within the brother-sister archetype between cooperation and competition, and between the myth and the reality of being brothers, having sisters, as well as the repeating motif of the missing brother or absent sister.