If antiques are older than....Business..and math the mother of money..?

..why do barren bachelors with a harem of habitually promiscuous sluts, adopt other men's children. Is it because they disgraced themselves with a closely related female? In ancient egypt when a new breed of animal became human, they often preferred their cousins or even sisters to the more proliferate of all the available females. This was frowned upon by the more carnivorous and promiscuous of the ruling cles. But as to the case in question, of Prince Jonathon adopted son of Saul, who rejected Princess Michael in favour of his sister. Then........