If your own children are just eating their breakfast now then I would move snack time up for everyone and serve it as soon as your own have eaten the ceral/toast part of their meal and give everyone some fruit and a glass of milk and either crackers or toast etc varying the amount by their arrival time. Then later in the morning offer just a drink and cracker or even just a drink of milk - foodish but barely filling as in will be out of the system by lunch. Better yet move lunch up and skip a later snack altogether. That is what I do. Snack is 8:30 and lunch is 11:00.