I would not do this at all. First of all I don't open until 7:30, second my maximum daily time with children is 9 hours, third, you are never going to get children to settle into any kind of routine when they are only with you 9 times a month. If I were you I would find a different family. Children need to be with their parents. Do these parents ever see their children? Of course they would be unhappy little people!