Children learn and play by mimetism. Me and my brother cooked a lot, as children, because my father was cooking most of the time (my sister still picked it up, but way latter).
I have been a summer camp counselor (and for 2 years a counselor year round at a non-profit, making physic and chemical experiments with kids, that's what brought me to CS) and I'd say role models are a big chunk of a kid outward character (at least before 12). Social group is another chunk, and obviously hormones is the last one dictated by first gender, but also food, and physical activity. Which to me is underrated. You aren't born as an adrenalin junkie, you become one. I've always been very meek and passive. Then I started windsurfing in hard/dangerous weather, and that totally changed my character. The 'surfer boy' cliché is real, but it's something you become, not something you are.