Have you read any of the articles on clannishness and consanguinity? Because you become more closely related to siblings, etc--
when your parents are closely related (genetically similar) to one another, whether genes causing clannishness spread depends--
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...on how inbred a society is. Inbred society = sibs > 1/2, cousins > 1/4 related to you, so less valuable aid to kin is "fit"
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(So what you say about artificial changes in the environment changing selection pressure is quite right: including inbreeding!)
End of conversation
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