Hi Debra.
We share the same great grandparent. My grandmother was Catherine McNally, daughter of John McNally and Catherine Brennan.
John died aged 91 on 25 April 1957. He lived at 308 Laurier St., Ottawa at the time.
Here are my records.
Catherine’s Parents:
Father: John Sylvester McNally b. 30 Sep 1865(1901 Canada census) , d. 25 Apr 1957; John was the son of George McNally (b. about 1823, d. 7 Dec 1874. Burial Fallowfield, Carleton, Ontario) and Mary Fagan (b. about 1830, d. 16 Feb 1913) who were married 22 Nov 1852 in St. Philips Church, Richmond, Ontario. John S. McNally was a CPR maintenance foreman for 35 years and is buried at Notre Dame Cemetery in Ottawa.
George McNally’s (John's father) parents were Andrew McNally and Eliza Wharton of Goulbourn. Mary Fagan’s parents were Michael Fagan and Mary Coleman also of Goulbourn.
Excerpt of marriage record:
22 Nov 1852: George McNally, son of Andrew McNally deceased and Eliza Wharton, to Mary Fagan, daughter of Michael Fagan and Mary Coleman, both of Goulbourn.
Mother: Catherine Brennan (b. 14 Jul 1866), daughter of Patrick Brennan (b. 1816) and Martha Devoy or Dubreuille (b.1836) of St. Philip’s parish in Goulbourne Twp., Richmond Ontario.
Census 1881 Canada:
http://data2.collectionscanada.gc.ca/e/e327/e008171190.pdf Census 1901 Canada:
http://data2.collectionscanada.gc.ca/1901/z/z003/z000100316....Marriage: 19 Feb 1912, St-Francois D’Assise, Ottawa, Ontario
Good luck with your research.