Contact your local CF Team and ask their advice. I'm sure they've dealt with this before (unfortunately) and they may have good advice. It's tough, not only is he dealing with the loss of a friend, but he's now dealing with the bigger issues that this could potentially happen to him too. We have had one issue with this about a year ago when my son was 12. We've always said, yes, people do sometimes die from CF, but you're in good health, etc..... and try to minimize the death topic. But when another child who had been relatively healthy also died from this disease, it was very hard. We did a lot of talking, a lot of praying and my son talked to his doctors about the situation. I think this same situation will be much more difficult when he's 17. HUGS! I hope someone else has better advice, but just talking and finding out what you can sometimes helps.