Curiouser and curiouser- 
The NAA has these two WW2 records, unfortunately not digitised.
William Henry DOWLING : Service Number - S1684 : 
Date of birth - 21 Feb 1922 : Place of birth - ADELAIDE SA : 
Place of enlistment - TORRENS HALL SA : 
Next of Kin - Nora DOWLING Michael DOWLING  : Service Number - NX147032 : 
Date of birth - 18 Sep 1902 : Place of birth - MANLY NSW : 
Place of enlistment - COWRA NSW : 
Next of Kin - Nora DOWLING Michael, I assume, is Nora's brother but one wonders about William Henry who is of an age to be a son of Nora.  And his second forename is the same as her father's - which may mean nothing, it's a common name.  Of course, the Nora who is listed as his NoK may be another person altogether.
http://www.naa.gov.au/collection/search/index.aspxJudith