Aw, poor little ones and poor you, but no I don't send children home unless they have a fever or vomit or diarrhea. Usually a low temp and clear running noses accompany a virus. If you see green mucous and the child has a high temp then it could be an infection and I'd call the parents and suggest a doctor's diagnosis. That's part of the job, I'm afraid. I hope for long naps for your crew until the colds are gone too!