Multiple theoretical studies and evolutionary models confirm that altruistic behavior toward genetic relatives can provide an evolutionary advantage through mechanisms of kin selection and inclusive fitness, as formalized by Hamilton's rule.
The retrieved literature consistently supports the concept that kin selection provides an evolutionary advantage for altruistic behaviors. Papers such as [4], [6], and [10] explicitly model familial selection, survival cost sharing, and general versions of Hamilton's rule, showing conditions under which altruism is evolutionarily stable. Other papers like [0], [1], and [7] frame inclusive fitness and kin selection as foundational to understanding altruism and cooperation among relatives. There is no evidence in the provided set refuting the claim.