I think depending on the area you live in it is actually the 'norm' for parents to have to juggle two different drop offs - one for full time daycare and another for 'school aged' daycare .... we cannot compete with the cost and ratios of 'before and after school only' programs run by licensed agencies cause, in Ontario anyway' they can have a ratio of 1:15 verses our 1:5 ratio and they can staff them for only the hours that they are needed aka 6-9 and 3-6 type things ... where as we sit there with an open space middle of the day and 'lost income' as a result if we were to just take a full time kid.
I have clients who've left their youngest with me and found alternate care for the older siblings and I have had people whose situation was just easier for them to move both kids because the younger sibling was going to be heading to school following year anyway so the clients found a longer term solution of someone willing to care for all three kids right away cause she was suppose to be coming back from a mat leave.