Welcome to the site Paula and congrats on baby Autumn! I found this site about 3 weeks ago when my unborn child was diagnosed with CF and I was a wreck and read all the same things you have been able to read and I was scared out of my mind and wondering what I was doing even thinking about having a baby! BUT in three short weeks, and mostly with assistance from this website, I have come to terms with what it is, what may be, what we have to do and that our "normal" will be defined differently than others "normal". I had never really heard of CF nor have I knowingly met anyone with the disease, but I have gone through a grieving of sorts for the child that I though I'd have which will not be and have made it to acceptance of what I will have and am thrilled now to want to be a mom to such a special child.
I know it will be hard, it will be hard each day for your daughter and son-in-law as well as the rest of the family, but what I asked of my baby's grandparents was to get informed, understand all they can about my child, help when I need it, but most of not to focus on illness, but that my child will be a wonderful grandchild that will do most normal things in life, with interruption by the hospital when need be. Be strong for your daughter because she has to be strong for her's and she will need a sounding board in you as well as somewhere she can breakdown because we can't in front of our children.
Please have her send a private message anytime as I am as new to the idea as she is.
Hang in there Paula and enjoy your new grandbaby! They will love you back 2-fold!