Abbott was born in St. Andrews,
Lower Canada (now
Saint-André-d'Argenteuil, Quebec), to Harriet (née Bradford) and the Rev.
Joseph Abbott, an
Anglican missionary from
Little Strickland, England. In 1849, Abbott married
Mary Martha Bethune (1823–1898), a relative of Dr.
Norman Bethune, a daughter of Anglican
clergyman and
McGill acting president
John Bethune, and a granddaughter of the
Presbyterian minister
John Bethune. The couple had four sons and four daughters, many of whom died without descendants. Their eldest surviving son, William Abbott, married the daughter of Colonel
John Hamilton Gray, a
Father of Confederation and
premier of
Prince Edward Island. Abbott was also the great-grandfather of
Canadian actor
Christopher Plummer and the first cousin (once removed) of
Maude Abbott, one of
Canada's earliest female medical graduates and an expert on congenital heart disease. Abbott was an
Orangeman and
Freemason.
Military service Abbott had served in the local militia “since boyhood”, being appointed an Ensign in the 2nd Montreal Militia Battalion in 1847. In 1849 he was a signatory to the
Montreal Annexation Manifesto, calling for union of the Canadas with the United States, resulting in the withdrawal of his commission in the militia. By 1850 however, he was reinstated and appointed a Captain in the 4th Montreal Militia Battalion. He commanded the regiment on the border multiple times throughout the
Fenian Raids, on March 8, 1866, they were called out for active service and were stationed in various villages throughout
Argenteuil. On June 11, 1866, the Rangers were called out to serve at
Cornwall, and then
Saint-Jean-sur-Richelieu, and a reporter from Montreal stated: {{Blockquote Abbott retired from the militia as a Lieutenant Colonel, commanding the 11th Battalion, on June 22, 1883. Taunted by his political opponents in March 1889 for his “disloyalty” in 1849, he explained that he considered his military service, and his commission as an officer and later commanding officer of the 11th Argenteuil Battalion of militia, to be evidence that his youthful error had been forgiven. ==Legal career==