A little girl complained to her father, “Daddy, I wish I had a little sister!”

Trying to be funny, her father joked, “But honey, you already have a sister!”

“I do?” asked the toddler.

“Sure,” her dad said. “You don’t see her because everytime you come in the front door, she scoots out the back door.”

The toddler thinks for a moment and then beams: “You mean just like my other Daddy!”