First, hand the bill for the fixed screen door to the Dad, good grief, how rude and obnoxious is he? Then when that's paid hand them the termination notice. In my contract it states verbal or physical abuse in my home is grounds for immediate termination.

Either that or start DEMANDING RESPECT! Have a talk with that dcMom and tell her that YOU did her a huge favour and so did your clients to make room for her child but you don't feel like being accomodating any longer to someone who can say condescending things to you. Stand up tall, be confident, pull up your big girl panties and remember that this is YOUR BUSINESS and you run it the way you see fit. I'm sure you're doing a wonderful job. But YOU need to realize it!