In a sample of parent-offspring and sibling-sibling pairs, as well as second degree relatives, who rated their own personality traits and life satisfaction and were each rated by an independent informant [N(participants) = 2,518 + informants], we found that parent-offspring and sibling correlations were at least a third higher than typically shown (r ≈ .20). These data put personality traits and life satisfaction’s narrow-sense (additive) heritability at around 40%, up from about 25% typical in self-report studies.
Could this be because people perceive small personality differences with relatives as more significant, having defined themselves as "the extraverted sister" or "not as obsessive as my Dad" for long enough that they see themselves as less like them overall? Dunno. Fun to think about.
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