In the 1891 Canadian census Whitby, Ontario. Head Mary S. Thomson, age 44, widow, born Scotland, both parents born in Scotland, religion Presb. Daughter Barbara Thomson, age 14, born Ontario, both parents born Scotland, Model? School pupil. Son John S. Thomson, age 13, born Ontario, Model? School pupil. Son James W. Thomson, age 11, born Ontario, Model? School pupil. Son Joseph B. Thomson, age 7, born Ontario, Model? School pupil.

In the 1901 Canadian census Whitby, Ontario. Head Mary S. Thomson, widow, born January 20 1847, age 54, born Scotland, immigrated 1854, farmer. Daughter Barbara J. Thomson, born May 10 1876, age 24. Son John S. Thomson, born November 15 1877, age 23. Son James W. Thomson, born April 3 1880, age 21. Son Joseph B. Thomson, born March 4 1884, age 17.