|Irish twins are a Guiness World Record|
Most of the heroes of the Bible are sent-away sons. Cain, Nimrod, Abraham, Joseph, Moses, David are examples, and most were men with blood on their hands. Cain killed Abel. Nimrod was a mighty hunter and a kingdom builder who forged his territory through conquest. Abraham killed in combat. Moses took the life of an Egyptian slave driver. David killed Goliath and arranged for the death of Uriah, Bathsheba's husband. The Bible does not sanitize the lives of these men.
Cain was the first ruler and city builder named in Genesis. Abraham, Terah's youngest son, built his territory between Hebron and Beersheba and Engedi and Gerar (the land of Edom). Moses, the youngest son of Amram, did not receive a territory. David, Jesse's youngest son, forged a kingdom in Judah and Galilee. Joseph became a ruler in Egypt. Birth order and the status of the man's mother are factors that must be considered in understanding the pattern of sent-away sons as kingdom builders. The first born son of the ruler's half-sister wife was never sent away. He ascended to the throne of his biological father. The first born son of the ruler's patrilineal cousin/niece bride served as a prime minister in the territory of his maternal grandfather, after whom he was named. Other sons were given gifts and sent away to establish territories of their own (Gen. 25:6).
In the case of twins in the Bible, the first born of the half-sister bride ascends to the throne of his father and the younger twin serves the older twin or is sent away, as happened with Jacob. It is often the younger twin who receives the blessing over the first born twin. Such is the case with Joseph's sons Manasseh and Ephraim, suggesting that they might have been twins. The pattern is found with Esau and Jacob (Gen. 25:1-28) and with Perez and Zerah (Gen. 38). In the case of Isaac's twins, this reversal is explained by family deception. In the case of Judah's twins, the reversal is explained by delayed birth. The first to breach the womb had a scarlet cord tied to his arm, but he was born after his brother. The Bible does not indicate how much later. Sometimes the second twin is born much later. Though this is very rare, it can happen with twins, as in this case of Irish twins born 87 days apart.