I worded it very badly... don't tell anyone that I'm a university communications professor LOL
What I meant to say was:
I would not let him come full days without paying a full day rate. Coming full days and paying for half a day is unfair. I would not feel guilty about asking him to come for a full day in order to ensure that my program doesn't suffer with a child who cries his way through nap time.
That's what I meant to say, can't you read my mind?