I am looking for advice. I am a 39 yo CFer. I have 4 siblings, all of which do not have CF. Both of my sisters have young children. My younger sister has a 6 yo who I worry about. He is very underweight and seems to get sick often in the winter. When he was about 2, her pediatrician wanted them to have him tested. They never did it. I worry about this little guy and don't know how to insist that this should be done. I think some people think if you don't know it will go away or they don't want to know. I am not saying this child has it, I just worry that if he does they are losing valuable therapy time. How do I bring this up in a gentle way that will motivate her to take it seriously and not scare the dickens out of her. Please give some practical advice.