consanguineous

adj

1. (not-comparable)Related by birth; descended from the same parent or ancestor.

   “Am not I consanguineous? am I not of her blood?”

   “2002, B. Modell and A. Darr, "Science and society: genetic counselling and customary consanguineous marriage," Nature Reviews: Genetics, vol 3. no. 3 (Mar.), p. 225, Consanguineous marriage is customary in many societies, but leads to an increased birth prevalence of infants with severe recessive disorders.”