There is an Allan’s Mill in Virginia, USA, but I am pretty sure his obituary is refering to Quebec.
They did have children, as there is a post on ancestry.ca that mentioned that James and Sophia are the maternal great grandparents of the writer.
His obituary from the Lanark Era, May 7, 1930:
“Perth, March 22nd, James Duncan Allan, aged 82 years. He was born at Allan’s Mill, February 20th, 1848, the son of the late John Allan, and Anne McLean. He was married at Carleton Place, Feb. 10th, 1873, to Sophia Marshall, of Ramsay. They had six daughters, of whom two have died, Minerva, wife of Fred Clark, the eldest and Mable, the youngest. The four survivors are; Annie (Mrs. Millar); Nellie (Mrs. Thos. Miller); Blanche (Mrs. John A. Geddes); and Viola (Mrs. J.A. Ferguson). Survived also by one brother, Robert Allan, of New Ontario, and one sister, Mrs. Samuel Donaldson, of Alberta.”