Originally Posted by Cat Herder:
You don't want to hear it, but you can't afford to NOT terminate.
Find another way.
This.
Last year I had two brothers who were somewhat like this. Oldest was 3.5 and I could hardly understand a word he said. Younger brother was following suit. They never engaged with the other kids, but were constantly wrestling with each other. I actually had an interview on a day when they happened to be the only kids here and honestly they turned off the potential client because they didn't engage at all with the "new" kids and were just rolling around on each other
And since I started making evaluation noises to mom, they didn't return this school year leaving me high and dry. So I lost out on a potentially good family, and they stuck me too.
Get rid of them before they start turning off your good families and turning away potential clients.