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Wanting to make a record, Greg books a recording studio and writes a song to perform with his siblings. However, when Peter's voice begins cracking, Greg realizes it's time to change and he's got to rearrange the music.
Bobby becomes self-conscious about his height and tries different ways to make himself "big." First he tries stretching himself, and then he decides to improve his mind by memorizing a bunch of worthless facts.
Jan discovers that Aunt Jenny had closely resembled her in her youth. Jan corresponds with Jenny and receives a photo in return, leading her to worry that she will grow up to look just like her strange-looking aunt. But when Jenny visits, Jan comes to appreciate her unusual lifestyle.