Answer :
Families in which brothers and their wives (or sisters and their husbands) live together in a single household are called joint families.
A joint family exists when several sets of siblings, along with their spouses and children, live together, sharing resources and responsibilities. Joint families typically only go after one side of the lineage (matriarchal or patriarchal.) An example of a joint family would be a set of biological brothers, their spouses, and those couples' offspring all residing in an identical home. Grandparents may or may not be present in the joint family structure.
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).
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