Moving the families to the station can be easy. First the family announces that one of them found a well-paid job abroad, sells the possessions and moves. Then it disappears from human view, and you can move them over to the colony. Some countries have pretty good control over people movements, but in the third world, people are largely untraceable. If a family moves say, to Asia, no one will be surprised to have communications cease with it. An occasional email will keep the relatives happy.