Celebrity Parents Justin Chambers and family at Knott's Berry Farm By Staff Author Published on January 4, 2008 02:36PM EST Grey’s Anatomy actor Justin Chambers, 37, and his family — wife Keisha, 12-year-old Isabella, twin ten-year-olds, Maya and Kaila, eight-year-old Eva and six-year-old Jackson — spend Wednesday, January 2nd at Knott’s Berry Farm in Buena Park, California. More images are available at Just Jared. Photos by INF.