In human context, a family is a group of people affiliated by consanguinity, affinity, or co-residence/shared consumption. Members of the immediate family may include a spouse, parent, brother and sister, and son and daughter. Members of the extended family may include grandparent, aunt, uncle, cousin, nephew and niece, or sibling-in-law. In most societies the family is the principal institution for the socialization of children. As a unit of socialization the family is the object of analysis for anthropologists and sociologists of the family. Sexual relations among the members are regulated by rules concerning incest such as the incest taboo. As the basic unit for raising children, anthropologists most generally classify family organization as matrifocal; conjugal; avuncular; or extended family in which parents and children co-reside with other members of one parent's family. Genealogy is a field which aims to trace family lineages through history. "Family" is used metaphorically to create more inclusive categories such as community, nationhood, global village and humanism.
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