A babysitter is someone hired for an evening while the parents go out on a date. A babysitter is short term. A childminder is more of a daytime thing. They are a pre-school and young child educator or daycare provider. This is also short term An au pair is a live in nanny who takes care of the kids. This person is there for a long while.

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The concept of "au pair" is that they are part of the family. They live there for a time. Most au pairs are involved with childcare, usually with some child care training, but not all.