Is this from real data?

I would think that the behavior of parents has a massive impact on the way the children grow up (but indeed, not the material stuff that so many parents fuss so much over), considering how strong of a correlation there is between the parents' belief systems and behaviors and their children's.

I read Psychology Applied to Modern Life and IIRC I was appalled by the number of X for which it says “it has been found that X has very little effect on children's development”.