I think this is probably another person.
Mary Ann Smith (nee Tabor) was living with her daughter Florence May and son-in-law Bertie Cooper in 1939 and was a widow, as Steven C posted above.
That means George W Smith died before or in 1939.
We need to find George W and Mary Ann Smith in the 1921 Census (not the one that Steve C thought it was them, with George W Smith Jn). All her living children were already married except for Florence May who married late that year (December), and Aflred Ernest, who was living with the Dunkling family in 1921.That's why I was trying to find her in the 1921 census as Florence May Parfrey,