The sibling correlation for IQ is about 0.40, i.e. most population variance is within families. Unless Richardson thinks that siblings raised together have vastly different social class backgrounds, his theory is... problematic.
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.49 according to largest review I know. But very old. Your point is still true though (up till r = .71).https://link.springer.com/article/10.1007%2FBF01067773?LI=true …
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Only up to .50. Siblings correlations are estimates of shared variance components.
End of conversation
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