I just want to balance this thread out a little...
I know many, many CFers who have siblings that do NOT have CF. It really is a personal decision, and most here will support you regardless of whichever decision you choose.
My personal opinion was not to try to have a child IF my husband was a carrier, but that was OUR decision. However, I try my hardest to respect other decisions whether I agree or not.
This very topic has been addressed many times in the adult section and usually gets locked...
One thing to consider is that CF siblings have a harder time maintaining a "normal" relationship. For example IF one sibling gets MRSA or Cepacia, how can you prevent the other sibing from contacting it - moreso if they are young and live together...My sister and I had gone through that for the past six years...I got MRSA six years ago and only saw here during the holidays during that time to avoid passing it onto her...That worked up until now...She was diagnosed with MRSA two weeks ago...We didn't live together once I was diagnosed with MRSA, thank God...However, what would you do if you had two younger siblings??? It's just something to think about...