Cystic Fibrosis

My sister is pregnant and did the genetic testing and found out she is a carrier of cystic fibrosis, they had her husband tested to see if he would carry it or not. I have been pregnant before and was never told anything about me having cystic fibrosis, i even did genetic testing..

What im wondering is, could my children inherit the cystic fibrosis and be carriers of the gene as she is from our parents? or can you only carry it if one of the parents have it? I would want to know if my children carry the gene incase they have children someday they will know. We do not know if my husband carriers it or not bc he wasnt tested but we are thinking about it for future pregnancies.. anyone know any info that could help would mean a lot!

prayers her baby doesnt have it and her husband doesnt carry it