My grandfather was William Cumiskey from Clonmellon Westmeath (b.1901). One problem when searching is that the Cumiskey name is spelled many different ways! I found the 1901/1911 census very useful in finding family members:(http://www.census.nationalarchives.ie/search/
). Try searching using wildcards eg "c*m**sk*y" which will also pick up a double m. Good luck!