K.D.
I understand a bit. I have a SIL that is very similar. Last time was getting my sleeping nb up, without asking, so she could hold him. The whole family was sick at the time. We do limit our connections with them and usually just the boy our son's age. Now we have two ready to play, but that issue hasn't risen yet. We do a lot at parks and other large areas where trading sicknesses is going to be less likely. I don't take toys, just let the kids play on the playground, so there's nothing to wash. You might consider finding some literature and giving it to them and specifically mention these circumstances. "When you did _______, it gave me ______. This literature will help you understand why it is so important for me to not to be exposed to illnesses. It would mean a lot to me if you would take the time to read this and ask me if you have any further questions." Their response will be very telling of how much contact you should have with them in the future.