Members of the immediate family includes spouses, parents, brothers, sisters, sons and/or daughters. Members of the extended family may include grandparents, aunts, uncles, cousins, nephews, nieces, and/or siblings-in-law.
In most societies, the family is the principal institution for the socialization of children. As the basic unit for raising children, anthropologistsgenerally classify most family organization as matrifocal (a mother and her children); conjugal (a husband, his wife, and children, also called the nuclear family); avuncular (for example, a grandparent, a brother, his sister, and her children); or extended (parents and children co-reside with other members of one parent’s family). Sexual relations among the members are regulated by rules concerning incest such as the incest taboo.
The word “family” is used metaphorically to create more inclusive categories such as community, nationhood, global village and humanism.