Genesis reflects an ancient Near Eastern world where family households were the main unit of economic life, security, and identity. Marriage normally involved joining families, managing land and labor, and producing heirs, with strong expectations about kin ties. Against that backdrop, the statement about leaving father and mother highlights a new primary loyalty formed in marriage, even while extended family remained important. The imagery of shared body and “one flesh” fits a culture that treated kinship as deeply embodied and relational, not merely contractual.