15. Do You Know Mary? Do you know Mary? Mary who? Mary McDonald. Of course I do. Do you know her little brother? Yes, of course I do. I know her older sister, Betty. And her younger sister, Sue1. Do you know her Aunt Yes, of course I do. I know her aunts and her uncles And her cousins too. Do you know her husband Bobby? Yes, of course I do. I know her husband and his brother And his father too.