William married Mary LAWRENCE, .xii on 10 Nov 1856 in Eglinton, (Toronto), York Co., Ontario. Mary (daughter of Major Peter Rezeau LAWRENCE, SUE and Elizabeth BETSY CUMMER, DUE) was born on 12 Jan 1829 in Eglinton, (Toronto), York Co., Ontario; died on 11 Aug 1921 in Toronto, York Co., Ontario; was buried in Mount Pleasant Cemetery, Toronto. [Group Sheet] [Family Chart]

1. Lieut Col. Percival Lawrence MASON was born on 24 Aug 1857 in Toronto, York Co., Ontario; died on 20 Jan 1938 in Gore of Toronto Twp., Peel Co., Ontario; was buried in Mount Pleasant Cemetery, Toronto.
2. William Effingham MASON was born on 11 Jan 1859 in Toronto, York Co., Ontario; died on 23 Sep 1860 in Toronto, York Co., Ontario; was buried in Mount Pleasant Cemetery, Toronto.
3. Alfred EFFINGHAM MASON was born on 2 Oct 1860 in Toronto, York Co., Ontario; died on 30 Apr 1940 in Vancouver, British Columbia.
4. Arthur Herbert MASON was born on 24 Jul 1862 in Toronto, York Co., Ontario; died on 28 Jan 1916 in Vancouver, British Columbia.
5. Bertha Elizabeth MASON was born on 12 Sep 1864 in Toronto, York Co., Ontario; died on 7 Dec 1929 in Toronto, York Co., Ontario; was buried on 9 Dec 1929 in Mount Pleasant Cemetery, Toronto.
6. William Ethelbert MASON was born on 16 Jul 1866 in Toronto, York Co., Ontario; died in 1951 in Regina, Saskatchewan; was buried in Regina Cemetery.
7. Thomas Harold MASON was born on 17 Jul 1868 in Toronto, York Co., Ontario; died on 8 Nov 1956 in Toronto, York Co., Ontario; was buried in Mount Pleasant Cemetery, Toronto.
8. Edward Morley MASON was born on 1 May 1870 in Toronto, York Co., Ontario; died on 10 Sep 1873 in Toronto, York Co., Ontario; was buried in Mount Pleasant Cemetery, Toronto.
9. John Franklin MASON was born on 2 Feb 1873 in Toronto, York Co., Ontario; died on 26 Apr 1873 in Toronto, York Co., Ontario; was buried in Mount Pleasant Cemetery, Toronto.
10. Lillia MASON was born in 1862 in Toronto, York Co., Ontario.