Imagine you are a genetic counselor, and a couple planning to start a family came to you for information. Charles was married once before, and he and his first wife had a child who has cystic fibrosis. The brother of his current wife, Elaine, died of cystic fibrosis. Neither Charles nor Elaine have the disease. What is the probability (as a fraction) that Charles and Elaine will have a baby with cystic fibrosis