[cmiles74]

I bet there are many that we take for granted. My first thought was social class; that's environmental and it's possible they all had this in common.

[truthaway12345]

Well can you make any sort of case for a causal arrow to support your dismissal? Because there is a case for a causal arrow in your dismissal target, given the article we're commenting on. The bar has been raised for "we said, they said" so you'll have to try a bit harder than assertively blaming environment.

[cmiles74]

The poster wondered what environmental factors these family members may have shared, social class is definitely one such factor.

Are you arguing that may not be the case? I think you would need more information about the poster's family to make that assertion.

[truthaway54321]

No, I'm saying that there is a demonstrated causal arrow from genes to intelligence. The evidence is less clear on the causality of social class and intelligence, however, so simply asserting it as a causative factor is not an effective rebuttal.