Family of Diffley, Farrell, Casey & Kelly - Lissonuffy - Derrycashel & Derryhanee

I am searching for family connected to James Diffley & Frances Diffley from Roscommon. 

James Diffley was married to Mariam Farrell 3 March 1840, Lisanuffy, Cloofinlough, Strokestown.  

Parents could be Joanis Diffley & Catherinae Casey; with the following baptism records of Brigidam (6 Feb 1831); Patritium (Jan 1834); Peter (30 June 1843) located.

My research from 1911, 1901 & 1841/51 including death registrations has identified living in Derrycashel and Derryhanee.. 

I'd appreciate any suggestions regarding the relationship between James & Frances Diffley. Frances emigrated to Canada in 1852/53 and most likely about 20 yrs old.   Her birth could be about 1832c

Cheers

Linda Ballantyne