You are third culture when you grow up between worlds. In my case between India, my birthplace, and Canada, my parents home. You identify strongly with both but are not really from either one.
Here is an article by Ruth Van Reken on how Obama’s new cabinet is heavily represented by third culture kids. From the article:
According to a body of sociological literature devoted to children who spend a portion of their developmental years outside their “passport country,” the classic profile of a “TCK” is someone with a global perspective who is socially adaptable and intellectually flexible. He or she is quick to think outside the box and can appreciate and reconcile different points of view. Beyond whatever diversity in background or appearance a TCK may bring to the party, there is a diversity of thought as well.
But TCKs can also feel rootless and detached. The great challenge for maturing Third Culture Kids is to forge a sense of personal and cultural identity from the various environments to which they been exposed.
But we also despaired when his opponents denigrated the importance of Obama’s childhood in Indonesia and Hawaii. “How can they say his international childhood doesn’t count when it comes to foreign affairs?” sputtered my friend and colleague, Paulette Bethel. “That’s just crazy. Barack’s been negotiating between cultural worlds since the day of his birth. No one will have to teach him this skill. It’s already second nature to him!”