Quite stark, but there's obviously some genetic confounding. How much is really causal? Data like these cannot answer the question.https://twitter.com/WilcoxNMP/status/576223336109309952 …
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Pretty sure they've done studies on genetic confounding and it doesn't eliminate the effect. Non-related adults are bad for kids.
This is a shared environment type effect, so it's ruled out already for all traits with 0 shared environment.