One important thing to keep in mind with any headline like this: twin studies have consistently shown that family environment contributes a negligible component

One important thing to keep in mind with any headline like this: twin studies have consistently shown that family environment contributes a negligible component to the cross-sectional variation of long-term adult outcomes. Consider any sort of child-rearing decision. In this case letting your toddler use an iPad or not. Is it within the realm of normal variation you'd find between families? In this case, yes: some families let kids have a lot of screen time, and some families strictly limit screen time. Well then, it almost certainly will have essentially zero impact on long-term adult outcomes. It may have a transitory short-term impact. Analogously, reading to kids may lead to learning to read at an earlier age. But twin studies tell us that by adulthood, the effect regresses to the mean. I.e. reading to kids a lot won't give them higher reading comprehension when they grow up.