In the 1881 census of Canada, Mosa, Middlesex West, Ontario.
Head Thomas Simpson, born 1837, Ontario, farmer, nationality English.
Catherine Simpson, born 1836 Scotland.
John Simpson, born 1865, Ontario.
Neil Simpson, born 1867, Ontario.
Joseph Simpson, born 1869, Ontario.
George Simpson, born 1871, Ontario.
Mary Simpson, 10 months old, born 1880, Ontario.
[The image is very faint, so some of the transcriber’s results may be incorrect.]

From photo of gravestone, Simpson Cemetery, 21563 Pratt Siding Road, Mosa Township, Middlesex County, Ontario. (https://cemetery.canadagenweb.org)
In loving memory of John C. Simpson Feb. 25th 1865, July 5th 1942.
Thomas C. Simpson May 1st 1901, Apr. 11th 1952.

Death Certificate
John C. Simpson died July 5 1942, Mosa Township, Middlesex County, age 77 years
Born February 25 1865, Ontario
Farmer
Wife Jean Simpson
Father Thomas Simpson, born England
Mother Catherine Campbell, born Scotland [actually at sea]
Informant son T. C. Simpson, of Wardsville
Buried July 7, Simpson cemetery