When I stopped the bus to pick up little five-year-old Chris for preschool, I noticed an older woman hugging him as he left the house.

"Is that your grandmother?" I asked Chris when he boarded.

"Yes," Chris said, "She's come to visit us for Christmas."

"How nice," I said, "Where does she live?"

"At the airport," Chris replied. "Whenever we want her we just go out there and get her."