Peter Duncan Colquhoun ²

   Another name for Peter was Peter D. Calquhoon.

  Research Notes:

His marital status on the 1861 Canada census was Widowed. In the 1881 census, his wife (and mother of children) is Mary. Mary was probably his second wife.

His surname is spelled Colquhoun on his gravestone, and the majority of records have it thus, including on his children.
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From FindaGrave.com:

Family links:
Parents:
John Colquhoun (1782 - 1865)
Agness McKellar Colquhoun (1792 - 1879)

Spouse:
Mary Brown Colquhoun (1841 - 1907)*

Siblings:
John Colquhoun (1819 - 1896)*
Alexander John Colquhoun (1820 - 1891)*
James J. Colquhoun (1824 - 1912)*
Peter Duncan Colquhoun (1830 - 1899)
Elizabeth Colquhoun (1833 - 1888)*

*Calculated relationship

Inscription:

COLQUHOUN
PETER D. COLQUHOUN
Born Mar 3, 1830
Died Aug 25, 1899
MARY BROWN
His Beloved Wife
Born Mar 11, 1841
Apr 10, 1907

  Noted events in his life were:

• Census: Canada, 1851, Williamsburgh Twp (South Dundas), Stormont, Dundas and Glengarry, Canada West (Ontario), Canada. ⁴

• Census: Canada, 1861, Williamsburgh Twp (South Dundas), Stormont, Dundas and Glengarry, Canada West (Ontario), Canada. Peter D Colquhoun, M, 31y, Widowed

• Occupation: farmer, 1871, Dunbar, Dundas, Stormont, Dundas and Glengarry, Ontario, Canada.

• Residence, 4 Mar 1871, Dunbar, Dundas, Stormont, Dundas and Glengarry, Ontario, Canada. ⁵

• Census: Canada, 1881, Williamsburgh Twp (South Dundas), Stormont, Dundas and Glengarry, Ontario, Canada. Household:
Peter D. Calquhoon, Head, M, 50y, Ontario, M, Farmer, Scottish, Preb Ch in C,
Mary Calquhoon, Wife, F, 40y, Ontario, M, English, Presb ch in C
Simeon Calquhoon, Son, M, 18y, Ontario, Farmer son
Jane Calquhoon, Daughter, F, 17y, Ontario
Cathrine Calquhoon, Daughter, F, 14y, Ontario
John Calquhoon, Son, M, 12y, Ontario
William Calquhoon, Son, M, 10y, Ontario
Margaret Calquhoon, Daughter, F, 7y, Ontario
Chesnut Calquhoon, Son, M, 4y, Ontario
Charles Calquhoon, Son, M, 2y, Ontario

• Residence, 1 Jan 1890, Williamsburgh Twp (South Dundas), Stormont, Dundas and Glengarry, Ontario, Canada. Residence based on the assumption that his daughter Catherine was living at home at the time of her marriage.

Peter married Mary Brown on 3 Apr 1862 in Dundas, Stormont, Dundas and Glengarry, Canada West (Ontario), Canada.¹ (Mary Brown was born on 11 Mar 1841 in Canada West (Ontario), Canada, died on 10 Apr 1907 in Williamsburgh Twp (South Dundas), Stormont, Dundas and Glengarry, Ontario, Canada ⁶ and was buried in Colquhoun Cemetery, Colquhoun, Stormont Dundas and Glengarry, Ontario, Canada.)