A grandmother was babysitting her granddaughter while her parents were away. The little girl was working on her homework. The assignment was to write a story about, 'Where my family came from.' So she went and asked her grandmother, "Grandma, where did I come from?" Her grandmother nervously said, "Why, you came from heaven, dear." Looking perplexed, the little girl asked, "How?" Her grandmother thought for a second, then said, "You drifted down from heaven on a cloud... and your mother caught you in a basket and brought you home." "OK. And where did mommy come from?" "She came from heaven, too." "What about you, grandma?" "Why, I came from heaven too," she replied. "Oh," the little girl thought for a second, "ok." She went and wrote it down. "Thanks." The next day she turned in her paper. It began, "For three generations there have been no natural births in our family."