I am reading Heather Cariou's book now. Don't be afraid to read it. I highly recommend it. It is an honest, open account of her life from the perspective of a sibling of a CFer. It is well written and very touching.
I agree with the above poster about CF info in print being out of date - but this is a memoir and therefore very relevant.
My personal opinion is that especially parents who have children with and without CF should read this story. It gives great insight into the effect CF has on the family dynamic, especially the "unaffected" siblings.
Give us your thoughts when you are done.