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, the larger extended family, and 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. Some sociologists and anthropologists consider the nuclear family as the most basic form of social organization.
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