What happens if a male Ego lives in a society practicing asymmetrical exchange marriage and his mother's brother does not have a daughter?

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In societies practicing asymmetrical exchange marriage, if a male's maternal uncle (mother's brother) does not have a daughter, the man must marry an appropriate woman born to a man of his mother's lineage to maintain the social and familial balance. This ensures that marriage alliances and obligations are fulfilled within the extended family network, preserving lineage and inheritance rules.

What Happens If a Male Ego Lives in a Society