The answer to the question in the title, Flynn explains, is that your family environment's effect on your IQ almost disappears by the age of 17. An important exception is in the vocabulary component of IQ tests, where the effect persists into the mid-20s and can make a big difference, at least in the US, to the chances of getting into a top university. The home has most influence in early childhood but is swamped by later environments at school, university and work. And they will more closely match your genes because you will seek out (and be chosen for) environments that match your "genetic potential", whether it's basketball, carpentry or mathematics.
https://www.theguardian.com/education/2016/sep/27/james-flynn-race-iq-myths-does-your-family-make-you-smarter
_- Steve
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