A little girl complained to her father, “Daddy, I wish I had a sister!” Trying to be funny, her father joked, “But, honey, you already have a sister.” Confused, the toddler asked, “I do?” “Sure,” her dad said, tongue in cheek. “You don’t see her because every time you come in the front door, she goes out the back door.” The confused toddler thought for a moment and then beamed, “Oh, you mean just like my other daddy!”