I drive a Mini Cooper. I love it. But it is not the most convenient car for taking three kids to school. Often the front passenger seat will be too far back or too far forward, and the kids will fight over the space. On Monday A pushed the seat back and squeezed N, who complained loudly. After I intervened A said "sorry". But he said it with that sarcastic tone and body language which conveys anything but sorry.
So we discussed how tone and body language are often more important than the words you use. They get it - even if, as usual, it seems they don't. They do. But how often and how frequent should I repeat things for the message to sink in?