Alice C. Linsley
The rulers among Abraham's people married cousins, nieces and half-sisters. The patrilineal parallel cousins are of special interest because they named their first-born sons after their fathers, thus enabling us to trace descent through many generations.
A patrilineal parallel cousin bride is a first cousin who is in the same descent group as her husband. In other words, she and her cousin husband have a common male ancestor. This appears to have been the preferred marriage arrangement for rulers among Abraham's Horite people whose religion was Egyptian/Nubian. These rulers had two wives living in separate households on a north-south axis. One wife was a cousin and the other was a half sister. In Abraham's case, Keturah was his cousin bride and Sarah was his sister bride.