I'm using an old nanny contract (which came from the agency we used previously) for our new nanny. She has quite rightly queried a provision which says that other nannies may be invited over to the house with their charges however she is responsible for any damage done as a result. Seems unusual to me... now it's very remote that anything like that is going to happen anyway, but what's the usual provision on that? is it that her nanny liability insurance covers it and that's why it's specified that she's responsible?