Correct, all of them! This is what you definitely should remember: the most important thing you can do is to understand the family dynamic and respect their house rules. As an au pair to an older child or teenager, you have a different relationship. Boundaries are important when caring for a teenager. Many host parents prefer their au pair to act as an older sibling, rather than a parent, when caring for older children. It is important that you and your host parents know each other’s expectations.