My ex lives with his girlfriend, she's just back from a country with a really high infection and death rate and so is subject to quarantine. Thing is, he still expects our (adult, still living at home with me) kids to go over to stay with him for his weekend today. He wasn't going to tell me about her being in Quarantine, but one of them told me. I've since messaged him and said I don't want them to go to his until her quarantine is over. Am I over reacting?