You Are Who You Are Thanks to Your Siblings?

http://www.time.com/time/archive/preview/0,10987,1209949,00.html
I found this article from Time magazine dealing with the relationship of siblings fascinating. The author says that "traditional" research has maintained that parents, friends, spouses and innate personality have been what shapes us most. The dynamics of siblings has, until fairly recently, not even been considered. We learn negotiation,sharing, arguing, fighting, many of our most significants traits from the time spent with our siblings. We will spend more time in the company of our siblings than with anyone else, and in our most formative years. Parents may pass away, spouses may go, but siblings will always be siblings. Even how well we can relate to the opposite sex may be related to whether we had a sibling of the opposite gender to "study". I found myself nodding in agreement with a great deal of what the article said. No matter how much or how little we are alike, for better or worse, those struggles with brothers and sisters have helped shape us to become the people we are today.
And if you don't have siblings, you've probably done just fine too. In the print article in Time there was a section that is not included in the online article that briefly delved into the dynamics of children from families with one child. The most recent research puts the lie to the thought that 'only children' are self centered and so forth. The latest studies have shown that single children do quite well with mastering social interaction and develop into just as well rounded, socially adept people as those with siblings. And my own thought, sometimes they are even better, aren't they?