The way I've worded it in my contract, and I'm paraphrasing but it's something along the lines of the deposit being NON-REFUNDABLE and that basically you get it back in CARE not cash. However if I decided to drop a family without notice I would give their deposit back as the care option is no longer available.

If you gave them two weeks notice and they decided to pull out early, then too bad for them. You are offering care but they are the ones choosing not to use it. The deposit is for these exact types of situations.