Both mothers were a Florence Hannah.
The Sydney Morning Herald - Thu 24 Nov 1938 p.10
GRAHAM.-November 23, 1938, at her daughter's residence, 15 Oxford street, Belmore, Florence Hannah Graham, loved mother of William, Arthur, Isabella, Florence and Alexander, aged 62 years.
Daughter Isabella not daughter Florence's residence.
1937, 1943 NSW Electoral Roll - Lang - Belmore
McRAE Alexander Frank, 15 Oxford street, clerk
McRAE Isabella Catherine, 15 Oxford street, home duties