dear kkrx, I am a 37 y.o. woman w/ CF. I think it is important for you to inform yourself as much as possible about the hardships of the disease. Not only for your fiance, but for you as well. I think this could greatly alleviate a lot of anxiety and/or surprises you might have. It would also show your parents that you are responsible & thoughtful about this decision. Also, I believe we love who we love for certain reasons. Everyone has something to offer, no matter how high maintenance they may be. I know I go through times of feeling guilty for putting my boyfriend through this lifestyle, but I also know that I have qualities that bring him a lot of joy. Maybe you could point out to your parents the wonderful qualities of your fiance.