If it were me, I would tell them about CAH & that it "runs in the family" since you have it, and that they might want to test now or after the child is born (if their state doesn't have screening). Like Sheila who lost a sibling, I lost a twin daughter, and others of us have lost children due to CAH. Thoughts are, that if their child did have CAH ... and something went wrong (like the child had a crisis at 3-4 weeks old), you might have guilt on your shoulders because you didn't say something to them earlier. Another way it could be told to them is that "you have CAH, it can easily be fatal & it's genetic, so they might want to consider getting tested now, but if don't want to, then after the baby is born, carefully watch any illnesses & any vomiting & know dehydration signs ... undiagnosed newborns have died because of CAH." And then give them an article on it (an article that discusses diagnosing newborns & the matter that death can occur).