Joe, Kevin, and Nick Jonas always said if they had a little sister they would be super protective over her. Well what if they did have a sister and she was secratly dating someone behind there back and the only one who knew was Nick? Could it split up the band, or family? What would Joe do, since he was the most protective of all of the brothers. Jenna just wants to grow up but her brothers are holding her back, what will she have to do to prove she isn't a kid anymore?