Influence: The Psychology of Persuasion · chapter 8 · id influence-c8-03-genetic-kinship-creates-the-st

“Genetic kinship creates the strongest unity bonds, explaining why family-based framing is the most powerful form of influence: people will sacrifice more for genetic relatives than for strangers.”

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Receipts

Hamilton (1964), The Genetical Evolution of Social Behaviour, J. Theor. Biol. 7(1)DOI registry: valid

Hamilton's rule: altruistic behavior evolves when rB > c, where r is genetic relatedness, B is benefit to recipient, c is cost to actor. Kin selection explains why organisms sacrifice for relatives.

DeBruine (2002), Facial Resemblance Enhances Trust, Proc. R. Soc. B 269(1498)FLAGGED: DOI not in registry

Facial resemblance increased trust in economic games, supporting the kin detection mechanism. However, the effect was small and limited to trust, not extending to broader cooperation or compliance measures.

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.