Some of these children may still be living.
It looks like they were born in Swan district.
Catherine C 1926
Beatrice Thelma 1928
George E F 1929
Alfred D 1930
Raymond Chas 1932, d. 16/11/10
Can't find the others.
If you go to Reverse Marriages WA (just Google it) you will find marriages for all of the above except George and Alfred. Frank and Graham may have married sisters. All seem to have stayed in the Swan district.
Once you have these, then check the White Pages online.