I have found quite a few possible matches,
For example, one very close match I found is that of a James Kenny married to a Bridget Killilea in 1868. James' father was Bryan Kenny whislt Bridget's was Michael, however these individuals are in Boyle, County Roscommon which isn't too far from Kilmacumsy, County Roscommon. This particular James and Bridget had children named Micheal , Winifred and Catherine. Are any of these individuals familiar?
Are there any further details that you may be able to provide that would help me to narrow the search?