When families get split up it can be difficult to find the facts to back up the bits that have been passed down. Here's a few facts to clarify the details you've started with-
Here's the link to 1911 census- the daughter's name looks like Ethel Mary not Ethne Mary but I can't see a birth for either (there is an Ethel Mary born 1920 Dublin) but no Ethel, or Ethne, Hunt born Cork.
www.census.nationalarchives.ie/pages/1911/Cork/Blarney/Curraghnalaght/383499Irish civil registration index has birth of Robert Wyndham 1868 Limerick registration district volume 10 page 569. Fits with information in 1911 census.
There is a marriage for a Robert Woodham Hunt (Oct./Dec.1909 Dublin South volume 2 page 553). Aileen Melita Elmhurst (Oct./Dec.1909 Dublin South volume 2 page
588 553)- there are 2 entries with the 2 different page numbers on LDS site.
In 1891 Census for England and Wales there's Aileen Melita Elmhirst, age 15, born Malta British Subject.
The civil registration index shows Norman Wyndham Hunt (1913 Cork), Cecily Elmhirst Hunt (Jan./Mar.1914 Limerick). Couldn't find a registration for a Faith Hunt. However, think I did find her as
Priscilla Hunt July/Sept.1916 Ennistimon registration district, Co.Clare (volume 4 page 177)- there is an entry for a Rachel Hunt on the same page.