i was a skinny little kid growing up as was my sister, she was six years older than me, my mom was always trying to fatten me up,(i don't have that problem anymore,on a diet now)... i had some problems with my lungs but more with my belly, my sister had more problems with her lungs... she started coughing up blood about the age of 16 and had two lung surgeries in her 20's/30's. i had 4 gut surgeries, they never put 2 and 2 together about us... when i was 44 (she was 50) i started to cough up blood and my cough started to sound just like hers, i knew right then that whatever it was we had the same thing. ( i was a heavy smoker for 18 years, but had quit about 10 years prior to getting dx because i couldn't breath anymore) about that time my family dr.retired, the new dr.said i should see a pulmo dr.,she did process of elimination, sent me for a sweat test, said she didn't think it was this but wanted to check (thank God for drs like that) called me back, said it was positive and that i should go to a c/f center. after i told the drs. at the center about my sister, they said they were positive she had c/f,have her come in to be tested, she did, she was. my sister linda died that year of breast cancer, went almost her whole life not knowing what it was that she had... its been 11 years now since i got dx.