It's as simple as this, cretins, how do you know the father is listening? How do you know he is ready to jump in to correct a mistake? How do you know he is feeding each transmission to his son? How do you know the father isn't answering the phone? How do you know he isn't reaching over to take a strip from the next desk? How do you know he isn't liaising with the next sector when the child makes a call. How do you know the child is a bright and responsible individual? How do you know he wouldn't transmit whilst his father is distracted? You don't, that's why you don't take instructions from a child.