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family in which members of a unilineal descent group (a group in which descent through either the female or the male line is emphasized) live together with their spouses and offspring in one homestead and under the authority of one of the members. The joint family is an extension of the nuclear family (parents and dependent children), and it typically grows when children of one sex do not leave their parents' home at marriage but bring their spouses to live with them. Thus, a patrilineal joint family might consist of an older man and his wife, his sons and unmarried daughters, his sons' wives and children, and so forth. For a man in the middle generation, belonging to a joint family means joining his conjugal family to his family of orientation (i.e., into which he was born)