Why do anthropologists use the term ego when mapping kinship relationships?

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Kinship An 18th-century family register listing births, marriages, and deaths within a kin group; in the National Archives, Washington, D.C.

In anthropology, anthropologists use the term ego to designate a specific individual who serves as the starting point for genealogical reckoning.1

By establishing this fixed reference point, researchers can systematically map how other individuals in a society relate to that person. This methodology allows anthropologists to identify and compare different kinship terminology systems across world cultures, such as distinguishing between lineal kin (those in a direct line of descent) and collateral kin (relatives outside that direct line). Using ego as a standardized anchor helps scholars analyze how various societies categorize relatives based on factors like generation, sex, and lineage, providing a consistent framework for studying complex social structures.1