By the end of this section, you will be able to: Define and contrast family and household. Describe how families differ across cultures. Differentiate between consanguineal and affinal ties. Distinguish between different family types. Understand the roles of fictive kin. A family can be defined as two or more people in an adaptable social and economic alliance that involves kinship, whether perceived through blood, marriage, or other permanent or semipermanent arrangement. It frequently, but not always, involves reproduction and the care of offspring and coresidence within the same locale. Families vary greatly across cultures and also adapt to changing social and economic needs. Sometimes families aggregate into larger units for short periods to meet challenging needs, such as eldercare, illness, job loss, transition between college and career, etc. A household is a group of individuals who live within the same residence and share socioeconomic needs associated with production and consumption. A family and a household may be the same unit, but they do not have to be. Sometimes families live within larger households, where there may be two or more families residing; at other times a family may be physically separated as family members migrate to work or study temporarily in other locations. Like the concept of kinship, family is a sociocultural construct. Family is defined and recognized differently across cultures according to differing social norms. Some cultures consider families to be only those people believed to be related to each other, living together, and sharing similar goals, while other cultures define family as a disperse set of individuals with an ancestral history. The definition of family that a cultural group endorses reflects such things as kinship and the social interpretation of biology, cultural traditions and norms, and socioemotional ties. It is commonly scaled from the intimate unit in which children are raised to a larger, more amorphous web of relatives. Many Western societies perceive family to be a nuclear family of parents and their immediate offspring living together in a household. The extended family, on the other hand, is a loose collection of relatives with varying degrees of perceived kinship, from those referred to as blood relatives (consanguine) to those who have married into the family (affine). Among the Mundurucú in the lowland Amazonia of Brazil, the resident family includes only the mother and her preadolescent offspring, while the father resides in the tribal men’s house. Among the Mosuo of China (also called the Na), women form sexual alliances with men from outside of their families to produce offspring, and then remain with their brothers in their own households to raise their children. The children are considered to be part of the women’s lineage unit and family. Figure 11.3 The Mosuo of China do not formally recognize a separate fatherhood role. Mosuo girls (left) and Mosuo boys (right) remain with their mother and her extended family, and fathers have no social or economic obligations for their biological offspring, though they often have significant responsibility for their nieces and nephews. (credit: “P8310032” and “P8310036” by Sherry Zhang/flickr, CC BY 2.0)