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Twin studies find a genetic component of .39 to .58. In terms of the environmental component, the shared family environment appears to be far less important than individual environmental factors (not shared by siblings) ^[1].

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1. ↑ Auke Tellegen, David T Lykken, Thomas J. Bouchard, Jr., Kimerly J. Wilcox, Nancy L. Segal, Stephen Rich (1988) Personality Similarity in Twins Reared Apart and Together Journal of Personality and Social Psychology Vol. 54, no. 6. 1031-1039

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