Are military brats, diplomat kids, and missionary kids all third culture kids?
Often, yes. Military, foreign service, missionary, and international business families were the classic TCK backgrounds the term was first used to describe. What they share is a childhood spent outside the parents' culture because of a parent's work - the details differ, but the moves, goodbyes, and complicated sense of home are common to all of them.
Same experience, different flavours
Military brats often moved on a fixed rhythm with a built-in community on base. Diplomat kids grew up on postings with clear start and end dates and a public role to play. Missionary kids frequently lived deep in a host culture and language. Corporate expat kids moved between international hubs and international schools. Children of aid workers grew up in places most people only see on the news.
The research on TCKs covers all of these - what differs is how the experience felt from the inside.
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What the research says
The sociologists who coined the term "third culture" for the shared culture of people living between cultures.
Useem, J., Useem, R. & Donoghue, J. (1963). Men in the Middle of the Third Culture. Human Organization, 22(3), 169-179.The standard reference on TCKs. Defines a TCK as someone who spends a significant part of their developmental years outside their parents' culture, and describes the common profile: the hard "where are you from?" question, the 'cultural chameleon', the 'hidden immigrant' feeling in the passport country, restlessness, and particular relationship patterns.
Pollock, D. C., Van Reken, R. E. & Pollock, M. V. Third Culture Kids: Growing Up Among Worlds (1999; 3rd ed. 2017). Nicholas Brealey.
Frequently asked questions
What's the difference between a military brat and a TCK?+
Many military brats are TCKs - especially those who lived abroad - but not all: a military kid who moved within one country shares the mobility, but not necessarily the cross-cultural part.