I have a family that I love a lot that I charged late fees to yesterday because they were (Her pick up time is 4:15, and she got here at 4:27) 7 mins late picking up thier son. I charge a 15 dollar flat fee, and then a dollar per min after... (I give 5 mins grace then start charging).
She came this morning with cash in hand...Because I will not take the child until late fees are paid. She owed me 22 bucks for 7 mins....And she knows that I stick to my policies.
I learned very fast that if you do not command respect that people take a mile from you.