I do not know your father's name or anything about him, but will post this for your possible interest.
In NSW there is not a marriage for CLARRIE (CLARENCE) NEALON to Margaret.
There is this-
REG 5510 IN 1913 NEALON, CLARENCE M
to PAYNE, MILDRED
PENRITH
This may be the man whose death is on Ryerson -your attention has been drawn to it by REGROSS above.
This couple had children and up to 1918 they were-
NEALON-
FRANCES E 1913, Penrith REG 46174
CLARENCE S. 1915 Canterbury REG 30118
Daphne E 1918 Canterbury REG 27642
There is a ww2 summary for a man named CLARENCE SPENCER NEALON and it may be the son above.
http://www.naa.gov.au/collection/using/search/Sue