Missionary’s kids (or MKs) are the children of missionary parents, and thus born or raised abroad (that is, on the "mission-field"). They form a subset of third culture kids (TCKs). The term is more specifically applied when these children return to their "home" or passport country (the country of their citizenship), and often experience various difficulties identifying with fellow citizens and integrating "back" into their "home" culture. The resulting feeling is described as "reverse culture shock".