If you have a nanny with own child, do you expect to pay for her plus her child, when they go on days out etc? Or would you just pay for her, but not her child? (Assuming they are going on outings that are fun/beneficial for all the children, i.e. her child is not being dragged somewhere purely for your dcs' benefit.)
I don't mind paying for them both, if that's the done/expected thing. Just wanted to check what others do.