Grant says she remembers many a time when one of her children lost a tooth and she forgot to put money under the lucky child's pillow. "Don't even ask about how our tooth fairy myth has evolved over the years to accommodate the fact that I so often forget to slip change under their pillows on the night a tooth has been lost," she wrote. "'She's traveling overseas!' 'She doesn't work on Tuesdays! I bet she'll come tonight!'"