Unfortuneately, their health comes first, even if that means missing out on fun events or family gatherings. In reality, sick people shouldn't be around anyone else, especially kids (CF or no CF), and should keep their germs to themselves. Alas, that hardly ever happens. We were going to cancel our Thanksgiving plans because our friend's baby had croop and they were bringing him. They decided last minute not to come, and we could go, but I didn't pressure them not to come, we just said if they showed up, we would politley excuse ourselves and have dinner at home. We never flatly say that's the reason we are leaving, so as to avoid conflict, but it's generally known. I consider myself to be a "go-with-the-flow" kind of mom, so I try not to jump the gun or threaten anyone. I wait til the event arrives and kind of play it by ear.