Hi Althea,
It does look like the most likely scenario,maybe names have got muddled in the oral history.
Here are James and Mary Ann
The Town Clerk's file 162/59 of 8/1/1960 at Auckland City Council Archives has K. McKeon describe James McKeon who died 9 August 1914 aged 88 years and his wife Mary Ann McKeon who died 4 December 1916 aged 77 years, both buried in the Catholic section. K. McKeon is a grandson. The Catholic register has James McKeon died 9 August 1914 aged 88 years and buried 11 August 1914 of Brown Street, confirmed a Symonds Street Cemetery burial from Little's funeral records at Auckland City Libraries.
The Little's funeral records at Auckland City Libraries have Mary Ann McKeon died 4 December 1916 aged 74 years and buried 6 December 1916 in Symonds Street Cemetery.
The New Zealand Herald of 10th August 1914 has James McKeon died 9 August 1914 aged 88 years, husband of M.A. McKeon, and buried 11 August 1914 in Symonds Street Cemetery.
Cheers Janette