Owen Lynch married Rose Duffy 10th Jun 1905 Massachusetts.
Open this link: https://familysearch.org/pal:/MM9.1.1/N4HZ-64F
Owen Lynch parents were Patrick Lynch & Bridget Rogers.
Rose Duffy parents were James Duffy & Annie Finegan.
Owen Lynch was born 28th May 1872 in Raferagh, Co.Monaghan, Ireland parents Patrick Lynch & Bridget Rogers.
Open this link: https://familysearch.org/pal:/MM9.1.1/FP14-HDZ
Rose Duffy was born 12th Feb 1880 in Corbeagh, Co.Cavan, Ireland parents James Duffy & Annie Finegan
Open this link: https://familysearch.org/pal:/MM9.1.1/FGXN-XW5
They were born in different county's but less than twenty minutes drive from each of the places above.
I think this is Rose in 1901 Ireland Census
Open Link: http://www.census.nationalarchives.ie/pages/1901/Cavan/Sherc...
And her family again in 1911 Ireland Census
Open Link: http://www.census.nationalarchives.ie/pages/1911/Cavan/Sherc...
Duffy family lived there in 1820's if not before http://titheapplotmentbooks.nationalarchives.ie/search/tab/r...
Im afraid granny may have being wrong Cavan and Monaghan are no where near Cork :)