The Catholic Church in Grenville,QC is Notre-Dame de Sept Douleurs. My great grand-parents and one great,great Grand father were married there. It was the parish, I have gathered, for both the English and French. My great grandfather was actually bilingual(surprise!). The cemetery is actually located in "Calumet" just north of Grenville on the east side of the hwy/road. (Went there to visit this summer)

hope this helps!
Louise