kimuchi's manga / #Construction worker(3)

Why is the doctor not allowed to discuss matters to the family when they were paying for Doyun's medical checkups ever since he was a minor? And Doyun's condition is not common, in fact it was said to be unheard of. The doctor is obligated to inform the family of his condition. Well, I do disagree with letting the whole family know but his parents should be top priority. I live in an asian environment & know for a fact that family doctors are more open & chill. I do think that the doctor acted slightly unprofessional but judging by the mother's reactions, he's no where near being a stranger. All of his jokes & unprofessional behavior is simply character development for the sake of the story line.