Well I have to ask what you mean by they know he was exposed? I got a call after being on vacation back east that one of my cousins kids had come down with the chicken pox's and my kids would have been around her I certainly did not notify anyone that my kids were possibly?? exposed to the chicken poxs, they did never get it. If they attend your dayhome should I have kept them home on some small possiblity that they could've caught it? What did the doctor say about your two month old getting them? Is this dayhome child not vaccinated against the chicken poxs? I really don't think there is anything you can do some other family may do the same thing. It sucks but that is what happens with kids they spread germs.