Originally Posted by Cat Herder:
When I offered part-time M+W+F was one slot, T+Th was another. Their rates combined equaled one full-time M-F slot, plus extra curriculum and supply expenses per child. 
Parents seemed to understand the concept easier when explained that way. 
Just because your T+Th slot is unfilled right now does not mean she is entitled to use it.
This! I had a mom like that. Every time a holiday fell on a Monday she tried to get a free day.