Am I My Parents?

How would Gladwell respond to the identity question from August 27th? How would Levitt and Dubner respond?

Gladwell would argue that while we spend most of our lives with our parents and they help us for an image of the world in which we live, most of our judgmental skills come from our peers. More competition is placed on someone when competing with peers than the rules our parents set out for us. We identify with our peers and learn from them. Siblings are a different story however, as shown in the experiment conducted by a Swedish team of scientists which found that if, for instance the youngest of three siblings is rather timid and submissive at home around older siblings, this child is perfectly capable of acting dominant around his peers.
Levitt and Dubner would argue that it is not the parents nor the peers with which one associates that shapes the person, but the environment that one grows up in. Cited in a U.S Department of Education study, it's quoted as saying,
"A child with at least 50 kids' books in his home, for instance, scores roughly 5 percentile points higher than a child with no books, and a child with 100 books scores another 5 percentile points higher than a child with 50 books."
Parents do matter according to Levitt and Dubner, it's just that the actual methods used by the parents do not matter.