Kinship structure is highly diverse, and there are many different ways to think about it. Descent is the way that families trace their kinship connections and social obligations to each other between generations of ancestors and generations to come. It is a primary factor in the delineation of kinship structures. Through descent, the individual highlights certain particular relationships with kindred and drops or leaves off other possible relationships. Descent ultimately determines such things as inheritance, alliance, and marriage rules. There are two common ways that a cultural group can trace descent across generations: Unilineal descent: Unilineal descent traces an individual’s kinship through a single gendered line, either male or female, as a collective social rule for all families within a society. The patrilineal or matrilineal relatives that connect to and from EGO form EGO’s lineage. This lineage is believed to be a continuous line of descent from an original ancestor. Lineages believed to be close in relationship are gathered into clans, a tribal social division denoting a group of lineages that have a presumed and symbolic kinship, and eventually into moieties (the social division of a tribe into two halves). In patrilineal (or agnatic) descent, the descent of both males and females is traced solely through male ancestors. Females hold the patrilineal descent of their fathers, and males pass on the descent through their children. Figure 11.11 A chart illustrating patrilineal descent across several generations. Note that all offspring individuals marked in blue are part of their father’s descent, but descent only passes through males. (attribution: Copyright Rice University, OpenStax, under CC BY 4.0 license) In matrilineal (or uterine) descent, the descent of both males and females is traced solely through female ancestors. Males hold the matrilineal descent of their mothers, and females pass on the descent through their children. Cognatic descent: Cognatic descent is a kinship structure that follows descent through both men and women, although it may vary by family. In ambilineal descent, an individual’s kinship is traced through a single gendered line, with each family choosing either the mother’s or the father’s descent line; in societies practicing this type of cognatic descent, some families will trace descent through the mother and others through the father. Usually families will choose their descent type at marriage based on the different opportunities presented by either the mother’s or father’s family, and they will use this for each of their children. While societies practicing ambilineal descent might initially look like those of unilineal descent, they are different. Within these societies, families are diverse and do not follow a single type of descent reckoning. In bilateral descent (also referred to as bilineal descent), an individual’s kinship is traced through both mother’s and father’s lines. This is the most common form of descent practiced in the United States today. Figure 11.12 A chart illustrating bilateral descent across several generations. Note that all offspring trace their lineage through both mother and father. (attribution: Copyright Rice University, OpenStax, under CC BY 4.0 license) Why does descent matter? It structures the way the family will be formed (who counts most in decision-making). It determines the choices individuals have in forming their own families. And it directs how material and symbolic resources (such as power and influence) will be dispersed across a group of people. As the example in the next section shows, descent affects the whole structure of society.