Centerstage Theatre's captivating production of "john & jen," which opened last night at Umpqua Community College, is certainly a show worth seeing. With smart and meaningful writing, "john & jen" portrays the unbreakable bond between brother and sister. Troy Pennington's fine direction brings to life this relatable musical and truly takes us on a walk through time.American sociopolitical history serves as the backdrop for the story, spanning patriotic idealism of the 1950s to the rebellious opposition of the 1990s. Big sister Jen (Erika Pennington) must grow up quickly to protect and teach her baby brother, John (Troy Pennington), about the …