Patricia Gretchen Mann Brewin (born December 23, 1938), known as Gretchen, is a Canadian politician. Brewin was born in Ottawa, Ontario to mother Marjorie Mann and Walter Mann on December 23, 1938. Gretchen has one sister, Susan Mann. She graduated from Glebe Collegiate and attended the University of Toronto for one year before marrying John Brewin in 1958. Her parents and parents-in-law were all active in the CCF (Cooperative Commonwealth Federation), and founding members of its new version, the NDP. Andrew Brewin, her father-in-law, was a member of parliament from 196 She and John had four children, Gillian (1959), Andrew (1960), Jennifer (1963), and Alison (1964) Brewin.