The Universality of the Family: A Conceptual Analysis

George P. Murdock's conception of the universal aspects of the family is examined by reference to the ethnographic literature. The results indicate that the nuclear family is not universal and that only the nurturant socialization function is universal. A revised conception of the family is offered which views the family institution as a small kinship structured group with the key function of nurturant socialization of the newborn. Nuturant socialization of the newborn is conceptualized as a functional prerequisite of human society, and some type of small kinship structured group is viewed as a structural prerequisite of human society for the fulfillment of this function. Three types of evidence are brought to bear on the universality of this definition: (1) cross-cultural evidence, (2) studies of nonhuman primates, and (3) studies of mother separation in human societies. The evidence tends to support the universality of the family definition proposed in this paper.