I believe that our attachment and future well-being is largely in part determined by the type of environment we grow up in, specifically in early preteen years. As an example, early (good) socialization of a child is most likely to produce a social adult in the future.
I highly agree with the idea that our future well being is partially determined by the environment we grow up in. I also think that it is possible other factors, including culture, race and religion (the type of values we get, the rules we learn, the way we think about people outside of ourselves), could effect our development.