Lilias Massey served as Chatelaine of Rideau Hall during her father-in-law Vincent Massey's term as Governor General of Canada.
Vincent Massey was a widower whose wife Alice died 18 months before his appointment as Governor General. Lilias, who was married to Vincent and Alice Massey's son Lionel, is to date the only person to have served as the official host or hostess of Rideau Hall who was not the Governor General's spouse.
Due to the conventions of formal address that were used in the 1950s, she may also be referred to in some references as Mrs. Lionel Massey rather than by her own given name. However, she was not given the honorary style of Her Excellency, which is given to the Governor General and a viceregal consort who is his or her spouse.