Now, she says, the two boys could not be more different: One is the social chair of his fraternity at the huge University of Wisconsin, while his other attends a school of 400 where “they basically study ancient Greek and read Aristotle.” And, she adds, “we’ll never know: Were they reacting to each other, or did they just come out that way, and all the parenting in the world wasn’t going to make them more similar?”