Help in testing

So my daughter is 3 almost 4 months. I did the testing and so did my oldest daughter, dont have or carry CF but my infant does carry with a low sweat test under 60 and has symptoms. I was told its possible for that to happen. Now! My daughters father will NOT get tested. His family refuses as well. I recently learned he has another daughter around 1 and I cannot find her (cue random lump sums of missing money from account). They said they need him or his brother or a child of his to get a full testing to narrow down what may affect her and what we can do now. I have more testing on the 14th so i dont know much. Can someone whos been through this give me any advice or tell me how i can get around them not being tested or what the next step is?
Source: Cystic Fibrosis Newly Diagnosed Forum - Category: Respiratory Medicine Authors: Tags: Newly Diagnosed Source Type: forums