nuclear family /n(y)o̅o̅″kle·ər/ [L, nucleus, nut kernel, familia, household] , a family unit consisting of the biological parents and their offspring. The nuclear family is a relatively recent product of Western society. The nuclear family unit is less efficient than an extended family unit in providing information and vital services to family members, such as child rearing, child care, and care of older family members. Compare extended family, matrifocal family.
