You could always say, "No, you be quiet." There would be nothing funnier than a grandmother and a bratty 6 yr old going at it in a verbal tug of war at Mickey Ds.
Well, I know where I will be taking my mother for her next birthday meal. If there is even the off chance of someone else, other than me, telling her to shut it...it gives me hope during this joyous holiday season.
Maybe he said, 'tell that woman to be quiet.' I wonder if the little girl has a low tolerance for noise. It would be interesting to have more information.