the rule: how adult personalities/intelligence turn out is due to: 50% genetics 0% family environment (how they're raised) 50% other environment (peers, media?, etc.) the question: 1) how seriously is this taken? 2) how do you divide family environment from other environment? I mean, to some extent, don't your decisions as a parent heavily influence their "other" environment. From who you allow them to hang out with to where you chose to live and put them through school? 3) Why? I know this will involve a lot of conjecture. My opinion is that children see their parents as more of an internal life-support system than part of the "real world".