I don't want to discourge you but don't be surprised even if you give her the information she chooses to ignore it. I have 2 son's who know that our family carries one of the CF genes and Graycie is proof that it can happen in our family. All 3 were expecting at the same time and when they found the MI on the ultrasound and did the amino on my daughter to confirm CF, neither one of my sons or their wifes told their own doctors. My oldest son's daughter is very small, not on the charts, and is sick alot, had RSV and was hopitalized and still no one told the doctor about CF in our family. I think its irresponsible to bury your head but no one can make them DO anything. I do hope your sister takes what you tell her and makes the best decision.