Access Extended: Patrick Dempsey's 'Grey's Anatomy' Family Reunion

Access Extended: Patrick Dempsey's 'Grey's Anatomy' Family Reunion

While on the set of “Grey’s Anatomy,” Patrick Dempsey reveals to Access’ Billy Bush details of the upcoming third episode of “Grey’s,” but is it a happy family reunion when Derek’s sister, Amelia, visits Seattle Grace? Also, how will McDreamy’s story unfold this season?