As a parent of three TCK’s, I see that the way their way of looking into the world is a bit different than children who did not have the experience of living abroad and growing up in primarily one culture.
David Pollock and Ruth Van Reken (2001) give a definition for TCK’s:
A person who has spent a significant part of his or her developmental years outside the parents’ culture. The TCK builds relationships to all of the cultures, while not having full ownership in any. Although elements from each culture are assimilated into the TCK’s life experience, the sense of belonging is in relationship to others of the same background.
Pollock, D. C., & Van Reken, R. E. (2001). Third Culture Kids: The experience of growing up among worlds. London, United Kingdom: Nicholas Brealey Publishing.