Termination.

[kindertime]

I agree that you should give a 3week notice for both kids. You will need a bit more time to fill two spots, just like the parents will need more time to find two spots. And you might find, (wishful thinking?) that once you've given the notice, and you're less stressed about the whole situation, it all gets a bit better anyway. You say the parents are aware of the lack of adjusting too, that's good, so hopefully it won't come as so much of a shock for them. Good luck.