Find gravesite or any other information

I am hoping to find the place where my great-grandparents were buried. They lived in Kilmore where my great-grandfather was a farmer.  They are Martin Glennon (born about 1846, died February 12, 1921 in Mountplunkett and Catherine Higgins Glennon (died October 18, 1935). 

I do not know the location of their house, the RC church they attended (though they were married in Killinvoy RC Chapel in 1878), or the cemetery where they might be. 

My grandmother, Mary Anne (Glennon) Besse emigrated to the United States in 1904, settling in Providence, RI, where she lived all her life, never having the opportunity to return to her birthplace. I was very young while she was alive, but I can vividly remember her telling some stories about her life in Roscommon; however, I was too young to remember many details about her family there. I have included a picture of her Roscommon birthplace and a photo of her right after she came to the states.

Any relevant information would be greatly appreciated!!!