Last night, I watched a documentary called Claire ik ein mijn broer (Claire, me, and my brother). It's about a family of triplets, two girls and a boy, and the two girls have CF.
The movie focuses mostly on Claire, because she has had two transplants and is dying from chronic rejection, but some parts do focus on Michelle and their brother, Vincent as well.
I suggest keeping a box of tissues nearby, you'll need them.
Even though it's in Dutch, there are English subtitles.
Click to view