If I am open then I charge. It is their choice to not bring their child. A few weeks ago my daughter was sick. I emailed all parents in the morning saying that I was closing that day at 1 so that I could take my daughter to the doctor. For days I close half day I only charge $15. I ended up with all parents making alternative arrangements but they still had to pay me $15 for the day. (when my daughter is not feeling well she lays on the couch upstairs away for the other children and if she is really sick then I send her to grandma's). Chances are the germs are in your house and the children have already been exposed to it anyways. I say charge them for Thursday and Friday.