I believe my dh is pg and also believe his upbringing affected him in very interesting ways. He is a middle child from what I would describe as a benignly dysfunctional family. The biggest effect seems to be that his parents were sufficiently absorbed in their own problems that they didn't pay much attention to the kids. Dh was not thrilled with his family life and retreated to the basement most of the time as a high school student to avoid the rest of the family. What he did in the basement is teach himself. He taught himself electronics and other things. The electronics he learned was extremely valuable later on, but taking charge of his own education was probably an even bigger outcome.