Kin Groups and Descent. The Yukpa practice the principle of bilateral descent which, in contrast to the more restrictive forms of patrilineal and matrilineal descent, forms an extensive consanguineal kindred. The Yukpa partition this kindred by terminologically classifying individuals related through distant ties of collaterality with lineal relatives, siblings, and descendants of same-sex siblings. This principle of merging provides individuals with a large classificatory kin group.
Kinship Terminology. Kinship terminology traditionally followed the Iroquois system of classification.