consanguinity

A consanguineous or family relationship through parentage or descent. A blood relationship.

1776, United States Declaration of Independence They too have been deaf to the voice of justice and of consanguinity.

At Isabella's earnest request, he took both her and the child on board, for the single hour which remained to the voyagers, to the satisfaction of all parties, and it seemed as if the long-drooping flower had already revived beneath the genial smile of consanguinity, and the very tears she had shed were sweet and grateful, refreshing the bosom moved so tenderly.

Inbreeding

The Mongrel Virginians was similar to other eugenic family studies in its method and mode of argumentation, but its intensive focus on "race mixing," rather than consanguinity, represents a marked departure from the previous studies.