Definition: In this task you will be given a passage and a yes/no question based on the passage. You should answer the question using the information from the passage.
Input: passage: Margaret ``Maggie'' Pierce, M.D. is a fictional character from the American television medical drama Grey's Anatomy, which airs on the American Broadcasting Company (ABC) in the United States. The character was created by series producer Shonda Rhimes and is portrayed by actress Kelly McCreary from the tenth season's penultimate episode onwards. It is revealed in the season ten finale, Maggie's biological parents are Richard Webber (James Pickens Jr.) and Ellis Grey (Kate Burton), making her Meredith's half-sister. McCreary was upgraded to a series regular in the eleventh episode of the eleventh season.
 question: is richard maggie's dad on grey's anatomy?

Yes