My 2 dd's have been invited to their classmates ( 1 in each class) house for first time- I don't know the family at all really, new to the school with their nanny in sole charge. Parents are out of town on business trips. I feel a bit like this is a bit strange. Can the nanny really be expected to look after 5 children ( their are 3 altogether in the other family). She looks very young and quiet from what I have briefly seen at school pick ups. Don't know what to do