What is the probability that ron and lydia son inherit

Ron has mild hemophilia that the can control by taking a clotting factor. He married Lydia, whom he met at the hospital where he and Lydia’s brother, Marvin, receive their treatment. Lydia and Marvin’s mother and father, Emma and Clyde do not have hemophilia. What is the probability that Ron and Lydia’s son inherit the disorder?

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