There is a birth on the QUEENSLAND Federation Index for a Stephen Sydney SMITH 1894 to George Guy (appears on a daughter's death entry as George Grey SMITH) SMITH & Esther JACKSON 10/04/1894 Reg: 1894/005426. - According to an Ancestry death entry he died 1952.
Stephen Sydney SMITH appears to have been a postal assistant living in Cork Street in 1936.
There was a Katherine Lucretia at the same CLAYFIELD addresses as Stephen Sydney SMITH.
Katherine L. FINLAY & Stephen S. SMITH married COONABARABRAN, N.S.W. 1919
Katherine Lucretia FINLAY appears to have been born 1893 COONABARABRAN, daughter of John FINLAY & Esther JACKSON
George Guy SMITH & Esther JACKSON married 1885 GULGONG, N.S.W.
John FINLAY & Esther JACKSON married 1892 GULGONG, N.S.W.
WW2roll has a Sydney Stephen SMITH born 1916 COOKTOWN.
There was a 1953 marriage PADDINGTON, NEW SOUTH WALES for a Sydney Stephen SMITH & Ann Theone Young WHITFORDE or YOUNG WHITFORDE.
A Dudley Murray WHITFORDE (son of William) shows up on the WW2roll as being born 1921 CLAYFIELD, QLD
The couple's engagement - TROVE - The Sydney Morning Herald Tuesday 11 August 1953; The Engagement is announced of Ann, only daughter of Mr. and Mrs. W. Young-Whitforde, of Rose Bay, to Sydney Stephen Smith, only son of the late Mr. and Mrs. S. Smith, of Papua.