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."