Parish history prior to 1841

I have a copy of a letter dated 13 April 1841, Pettigo, and signed by Father Ryan, Lough Derg   stating that my ancestors -Patrick McGinley and his wife Kitty McGrath had been born and always lived in "this parish" . He does not give the name of the parish but my research tells me it was probably Templecarne.or Templecarne -Mcgrath as apparently it was once called. Do you think this is correct, or is there another possibility? Patrick and Kitty were leaving for Canada at that time, along with their 9 children, aged 3 to 24. I am wondering if parish records could give me any more information on this family i.e Roman Catholic records..            Thankyou,

                                                                         Ruth McGetrick