Just a guess, from the death searches showing on SP, you get the feeling that most of the family stayed in the Edinburgh area. There are as possibilities:
A death showing in 1969 for a Thomasina P Banner, other surname INGLIS, who died in Edinburgh in 1969, aged 69 (born c. 1900).
A further death in 1972 for a William Francis Banner, who died in Edinburgh aged 80 (born c. 1892 - a couple of years light of that possible birth year of 1888).
We are also missing the children born between 1901-11. The release of the Scottish 1911 census on 5 April will help you with this. We know that a sister E. Banner reported brother Francis' death in 1953.
Monica