Ellen was born about 1915-1916, you could try looking for her parents and siblings if born younger in the 1911 Irish census.
www.census.nationalarchives.ie I think anything earlier would give you too many. If there is a possibility that Percy is still alive then he must be quite old.
The parents might not be married yet and you could search separately for them. There are quite a lot of choices.
The parents of the couple would name their children for their parents, 1st. son after father's father; 2nd. son after wife's father; 1st. girl after mother's mother, and 2nd. girl after father's mother.
www.familysearch.org Civil Registrations for Ireland 1864-1950's
Probably Ancestry is your best bet for obituaries. Or
www.findagrave.com for a gravestone
inscription.
Annette Code
no relation