Honestly,
I have terminated a family on the spot before, and to prevent this from happening (I knew they were the type to make a huge deal about nothing, and fight tooth and nail) I termed the child on the spot, took my monthly rate divided it, by the number of days remaining in the month, and gave them a refund, and made them sign saying they got it.
I also had their rec. all the child's belongings and everything ready to go at pick up so they would have no excuse to return to my home at all.
I have also had the reverse happen to me where a parent decided that I was no longer a good fit, and termed with no notice, right at the end of the month. I was technically owed a month according to my contract, but rather than fight, and they turned into total nut balls too, I just took their notice, and bid them adieu. I also mailed them their daycare receipt registered mail, and washed my hands of them.
Sometimes, even though we have legally binding agreements in order to avoid slander, liable, and unwelcome guests we have to do the next best thing.