Green Thumb

When our Grand Daughters would come over, they would like to water the plants with the large watering can that we had.
 Seeing that, my wife went out and bought two mini, bright yellow watering cans. The next time they came over, they got really excited when then saw the little cans. I stared filling and they started going all around watering. After a few fillings the youngest lost interest. The oldest kept coming back for more fillings. Then she said. "Grand Ma Anna sure has a lots of plants to water!" I , without thinking, responded, "Your Grand Ma has a green thumb" . She gasped ! "I never saw Grand Ma Anna's green thumb!" I laughed to myself and went on to explain that her Grand Ma didn't really have a green thumb and that it was just a way saying that someone loves plants and could make anything grow.. She was silent for a while, but I could see that she was pondering what I had said. Then she said " Grand Pa Frank, when I grow up, I want to have a "green thumb" just like Grand Ma Anna." What a Joy!