The 1965 Voters' List shows Mrs. Ethel Davison at 353 Brunswick Avenue, along with Miss Verne Davision, a dress designer. Frank is not listed, so must have been deceased by this time. The 1963 list shows the same information.
In 1953, Ethel and "Myrna" are listed, but no Frank either. As Verne (Verna) is listed as "Miss", it indicates she did not marry as late as 1965 which suggests there were no descendants. No other adult children are listed with the family in any of the voters' lists.
In the 1940 list, Verne is not listed which suggests that she was not yet of age, so perhaps a birth year of after 1920?