Don't feel bad. They are doing what works for them and trying to keep care as long as they can. I get that to some degree, but in the same vein, you should not feel bad about doing what works for you. I have had a nasty termination in the past with people just like this. They did get very angry and showed their true colors when I did it and I spent a lot of time doubting that I did the right thing, even though they were very clearly in the wrong and the kids were a threat to my business. The first day I didn't have to dread those kids on my doorstep was the greatest, most stress-free day I can remember. The group dynamic changed and I loved my job again. Good for you for terminating. We are all here for you.