That's an intriguing point. I always thought children of professors/teachers would be better in school because their parents would push them (gently!) in that direction (and because they are probably genetically inclined to be good learners...), but this type of indirect watching of their parents and what they value must have quite a big impact as well (also in that the parents are natural role models). My parents had quite a hands-off approach (they're not teachers, as you might have guessed ;)) and I subsequently didn't care much about my grades or certain school subjects that I found uninteresting.