I think you have just answered your own question...tell them "you aren't a drop-in-service"..I had one that used to come anywhere up til 11:00 am....when I told her I don't serve breakfast after 9:30...she was pretty much coming before then. I also tell parents we go for our walk between 9:30 and 10:00....if you aren't here by then....we wait for nobody..COME FIND US....I DID HAVE SOME WHO ENDED UP GOING HOME BECAUSE THEY COULDN'T FIND US...not my problem...they will change....