In my contract I say that I provide morning snack lunch and afternoon snack. If a parent is running late I've had them text and ask if we have had snack yet and if we haven't I will wait the ten minutes until they get here. I also have two parents that send their kids with breakfast and they eat it once they get here and we are waiting for more friends to arrive. Maybe you could suggest they send their child's breakfast if they don't have time to get breakfast into the kid in the morning?