I had to terminate a family this year and the father went from devastated to furious with me in the course of 15 minutes or so but it seemed like an eternity and they didn't come back. But at least he was professional and sane! Your dcDad is being a petty, vindictive, childish brat! Rise above it sweetie and push on.
I know it's easy to say and hard to do but hold your chin up high and be proud of yourself. You are a businesswoman, it's your right to work with whomever you choose. When people are in your home or your daycare they should be respectful and mature and sensible. You deserve nothing less. Don't let the petty people pull you down to their level. The next family will renew your faith in people I hope.