William Brewster III was the son of Capt. William Brewster, Jr. (1533-1622) and Mary Smythe Simkinson (1537-1655), Capt. William Brewster, Jr. was the son of Col. William Brewster, Sr. (1500-1616) and Maud Mann (1506-1619), William III lived in Scrooby, Nottinghamshire, England.