Comment by satisfice

I agree. A child is a million small datapoints. My son established a strong personality early on that defied our attempts to modify it. Meanwhile he was raised in a relaxed environment that certainly provided no environmental explanation for his fixations.

I was raised with five siblings, yet only I got into fights at school, and made my mother cry on a regular basis. Each of my sibs is similar and each of us is strikingly different, too.