Hi Lorri
Herewith, the death notice for Georgiana (Georgina).
"Evening Post" (Wellington, NZ) - 18 May 1946
MARTIN - on 18 May 1946 at her home, 48 Darlington Road, Miramar, Georgina, dearly-loved mother of Vera and Lindsey and the late Cyril Martin (killed in France 1918). So loved, so mourned. Private Interment.
---------------------------------
So, just the three children (and no mention of Frederick.)
In respect of Lindsey and Vera, I searched both Wellington newspapers of the time ("Evening Post" and "Dominion") for several days either side of their deaths, and sadly found no notices for them.
[I get the feeling that they were probably very private people ? ]
~ Lu