Maggie Pierce

Margaret "Maggie" Pierce, M.D., F.A.C.S., is a fictional character from the medical drama Grey's Anatomy, which airs on the American Broadcasting Company (ABC), portrayed by Kelly McCreary. Created by series producer Shonda Rhimes, Maggie first appeared in the penultimate episode of the show's tenth season and was promoted to a series regular by the eleventh season's eleventh episode. Her character is revealed to be the biological daughter of Richard Webber and Ellis Grey, making her the half-sister of series protagonist Meredith Grey.