Nuclear family

A nuclear family, elementary family or conjugal family is a family group consisting of two parents and their children (one or more). It is in contrast to a single-parent family, to the larger extended family, and to a family with more than two parents. Nuclear families typically center on a married couple; the nuclear family may have any number of children. There are differences in definition among observers; some definitions allow only biological children that are full-blood siblings, but others allow for a stepparent and any mix of dependent children including stepchildren and adopted children.

Family structures of a married couple and their children were present in Western Europe and New England in the 17th century, influenced by church and theocratic governments. With the emergence of proto-industrialization and early capitalism, the nuclear family became a financially viable social unit. The term nuclear family first appeared in the early twentieth century. Alternative definitions have evolved to include family units headed by same-sex parents and perhaps additional adult relatives who take on a cohabiting parental role; in the latter case, it also receives the name of conjugal family.

The concept that a narrowly defined nuclear family is central to stability in modern society has been promoted by familialists who are social conservatives in the United States, and has been challenged as historically and sociologically inadequate to describe the complexity of actual family relations.

As a fertility factor, single nuclear family households generally have a higher number of children than co-operative living arrangements according to studies from both the Western world and India.

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