Katie is psyched for the Parent-Kid Olympics at her school.

But it turns out that her parents will be out of town, and so Katie’s grandfather is going to team up with her instead. Now Katie is worried—Pops is great, but he’s . . . well, he’s OLD!

Then the magic wind arrives just in time to cause more trouble. Who has Katie switcherooed into this time? Do aching knees and nose hair give you a clue?