See it takes a mother and father to both carry the cf gene. If your child is a carrier then she has the gene but not CF. If both parents have the gene the out of four kids one will have cf two will be carriers and one will be fine. If your child is a carrier then when they look at having kids they need to have gene testing done. To see if the other parent had the cf gene. I hope that this helps. Both of my kids are carriers.