Jim Harbaugh's son is joining his father's coaching staff at the University of Michigan.  Jay Harbaugh will serve as the Wolverines' tight ends and assistant special teams coordinator.  The 25-year-old has worked the past three seasons for his uncle, Baltimore Ravens head coach John Harbaugh.  He served as an offensive quality control person this past season.  Jay becomes the second son to join his father's coaching staff in the Big Ten.  Brian Ferentz, the son of Iowa's Kirk Ferentz, has been working for the Hawkeyes since 2012.  Jim Harbaugh was hired to coach his alma mater after mutually parting ways with the San Francisco 49ers after four seasons.