I have searched in the 1901 and 1911 census for all marriages of John Clarke and Rose Clarke throughout the Country. There are no results in Dublin, these are the results in other parts of the Country:
1901 Census
http://www.census.nationalarchives.ie/pages/1901/Cavan/Bailieboro/C...
http://www.census.nationalarchives.ie/pages/1901/Cavan/Drumenespic/...
http://www.census.nationalarchives.ie/pages/1901/Cavan/Drumenespic/...
http://www.census.nationalarchives.ie/pages/1901/Roscommon/Cloonfow...
The Corkish family had 6 children in 1901.
The Monaghnose family do not list any children, our grandmother would not have been born yet (1903) would she have had older siblings?
The Tullywaltry family had 5 children in 1901.
The Cloonflower family had 4 children in 1901.
1911 Census
http://www.census.nationalarchives.ie/pages/1911/Cavan/Drumanespick...
http://www.census.nationalarchives.ie/pages/1911/Cavan/Drumanespick...
http://www.census.nationalarchives.ie/pages/1911/Roscommon/Cloonflo...
These are 3 of the same families as listed in 1901 census.