A U.P.S. driver has a package to deliver to Mrs. Jackson. So he drives to the address, which is a townhouse. A little girl is sitting on the steps leading up to the entrance, playing with a doll. The driver asks the girl, "Is your mother at home?" "Yes," replies the girl. The driver climbs the stairs & knocks at the door. No answer. He waits for a minute & knocks again. As nobody comes to the door, the driver goes back down the stairs & says to the girl, "I thought you said that your mom was at home." So the girl replies, "Yes, Mom is at home, but we don't live here."