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Is it surprising? Intelligence isn't 100% hereditary; maybe 50% can be attributed to genetic factors? So if you see three family members performing at world-class intelligence levels, you might actually be experiencing a nurture argument, not a nature argument. The heritability of intelligence isn't strong enough to explain that outcome through nature.

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Another front page thread tonight has multiple people saying it's 0.4 hereditary at childhood, rising to 0.75 by adulthood. Height is 0.8. I take those numbers with healthy skepticism, having not read the source material, but they aren't out of thin air.

Could you link me that thread?

Ultimately the "environmental" factor depends on how much the environment naturally varies from family to family. Anyway, having one IMO kid is virtually not possible with most parents' genetic contribution, and there are plenty of IMO competitors with siblings that would have no hope of being such, where, if there was an environmental factor, the question was decided by the second birthday as a result of air quality, lead paint, or what music was on the radio.

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