Send a message to the person who requested a photo of the grave monument of John Gillis with the following comment:
I believe these are my great-great-great grandparents. Their son John Gillis, born 1833, fathered James H. Gillis, my great grandfather in 1864, and emigrated to the United States in 1869. James married my great-grandmother, Mary Riordan, in 1892, and fathered my maternal grandmother, Helen Gillis, in 1893.