Right, back to the beginning (again) here to sort out a few things.
Chronology-
1868 birth of Robert Wyndham Hunter in Limerick
1875 birth of Aileen Melita Elmhirst in Malta
1891 census England: Aileen Melita Elmhirst, age 15, born Malta
1907 death of Robert’s mother Mary Hunt
1909 marriage of Robert Hunter & Aileen Elmhirst in Dublin
1910 birth of Ethne Mary Hunt
1911 census (1) Curraghnalaght, Cork: Robert Windham Hunt (retired military officer), wife Aileen, dau. Ethne, parlourmaid.
1913 birth of Norman Wyndham Hunt in Cork
1913 birth of Cecily Elmhirst in Limerick
1916 (2) death of Robert’s brother (William) George
1916 birth of twins Rachel and Faith (Priscilla) in Ennistimon dist., Clare
c1916 Ethne (age 6) sent to uncle Harry Elmhirst in England, one of twins to Aunt Dolly, Dublin
1919 Robert’s father W.L. Hunt dies
1920 (3) date on gravestone for death of Robert Hunt
1921 (4) death registration for a Robert Hunt (born c1869) in Limerick dist.
1940 (5) supposed death of Robert Hunt & wife Aileen
(1) Robert was retired military officer. Quite possible he enlisted/was called up? in WWI. Can military records be searched to see if medical/death details, information on wife, etc. given?
(2) Robert's brother George died in 1916 around the time twins were born and children dispersed amongst relations. Could he have been injured in War or had a breakdown?
(3) do you have an exact date of death from the memorial or just the year? If exact date then would be worth searching for newspaper obituary, etc.
(4) death registration for Robert Hunt 1920- we have been saying for days that this is the next logical step. If it is Robert his marital status will confirm if Aileen dead or alive, cause and place of death might have bearing on family breakdown, informant may provide further clues.
(5) only basis for this seems to be family story which might not be reliable.
continued in next post...