Many different kinship structures send a son away (or search outside their immediate kin groups) for a marriage partner. What rule does this reflect?

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This rule reflects exogamy, which is the cultural practice of marrying outside one's kin group. This is common in many societies as a way to avoid inbreeding and strengthen social alliances between different groups. Sending a son away or searching outside the immediate kin group for a marriage partner is one way to ensure exogamy.

Many Different Kinship Structures Send a Son Away (Or Search