Not necessarily. That's the way recessive genes work: they “hide” as they are passed down through the generations, unless or until they are paired with a matching recessive gene. Something like one in twenty Caucasians is a carrier of the CF gene, and most don't know it.
Having made the above scientific point, I'll express my disgust at these parents for demanding compensation for not having been given the info they “needed” in order to have their child murdered in utero.
(By the way, cystic fibrosis has no effect on the intellect, so this couple's daughter surely will read all about her parents’ lawsuit. Wonder how she'll feel when she learns that her parents were crushed that they hadn't known enough to kill her when they had the chance.)
I’m sure she will hear it all mentioned in some argument before she reads it anywhere-plenty of kids have begun negative attention-getting behavior when they found out they weren’t as perfect as their parents expected-these parents deserve that and more...