do you have your own kids? I"m thinking not because usually they at least get how "challenging" a couple of hours with 1 or 2 can be and therefore can imagine more kids for 10 hour days. Yikes. How disappointing to be so misunderstood. Really, you can't have your own kids...I just don't understand.
Totally book an appointment at a time when the only solution is to have him cover for you. Even like just the last half hour to close up or something. He'll get it pretty quick.