A Host Family is a family that reaches an agreement with a young foreign student, known as Au Pair; they receive her in their house for a previously agreed period. The Au Pair takes care of the children and helps with simple domestic tasks. In return, the Family offers room and board, treat her as a member of the family, make possible her attending to language classes and pays her a weekly pocket money.
To host an Au Pair is actually cheaper than a professional helper.
What is a Host Family