When Nancy's parents win an all-expenses-paid vacation, Nancy and JoJo get to sleep over at their neighbor's home, Mrs. DeVines. But JoJo is a little nervous to sleep at someone elses house--luckily Nancy is an expert on sleepovers and can help prepare her little sister. The big night arrives, and JoJo and Nancy have a blast at Mrs. DeVines. But when it's time for bed, it turns out Nancy wasn't as prepared as she thought. Good thing there is nothing better than a sister to make you feel better.
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