Hi, I have an earlier William Abbott who moved from NH/Maine/Vermont up to Canada. Do you think there might be a connection? Could your William be older than the dates you show? If he married three times, perhaps the children you list are only the ones from his last marriage, and perhaps Jacob, John, Timothy, and Robert are from an earlier marriage. If the following mini-bio is correct, this William b. 1765 is the same William Abbott who moved to Mersea Township, Essex County, Ontario, near Point Pelee. If not the same man, could your William (b.1790/1795) who married Abigail Sprague or Griesham perhaps be a son of the William Abbott b.1764/1765?
----------(Quoting from LONG POINT SETTLERS site)----------
"Abbott, William (c. 1765- ), a carpenter, lived in Fryeburg, Oxford County, Maine [near the N.H. border] and married three times. He moved to Quebec by 1812 settling south of Montreal and served in the local militia at Isle aux Noix during the war of 1812-14. William brought his family to Norfolk County [Ontario] about 1817 and settled on a farm in Middleton Township. He then moved to Mersea Township, Essex County [Ontario] by 1829. His son Timothy Abbott (1800-1878) stayed in Norfolk and married Phoebe Brown, a daughter of pioneer Samuel Brown. The couple settled in Erie View, Walsingham Township. Younger son Robert Mears Abbott (1802-1885) married Hannah Sherman and farmed beside his brother Timothy until 1856 when they moved to a farm in Bloomer Twp., Montcalm Co., Michigan and founded the village of Carson City [Michigan]." (from THE LONG POINT SETTLERS at http://sites.google.com/site/longpointsettlers/order-form/se...
March 4, 1795 Marr: William ABBOTT and Anna DANFORTH, both of Chatham, N.H., [married] by the Rev. Mr. William FEFSENDEN at Fryeburg, Oxford Co, Maine (see http://www.fryeburghistorical.org/pdf/vital-records%201777-1...
He may have been the William Abbot christened 21 Oct 1764 at Wakefield, Carroll Co., N.H., son of Elizabeth Abbot (a single mother) and an unknown father. Wakefield is near Chatham, N.H., where William lived when he married Anna Danforth.
----------(CHILDREN OF WILLIAM ABBOTT & ANNA DANFORTH)----------
Children of William Abbott (1765-????) include: 1.Jacob Abbott b. 22 June 1796 at Fryeburg, Oxford Co, Maine; 2.John Abbott b. 25 Jan 1798 at Fryeburg, Oxford Co, Maine; 3.Timothy Abbott b. 3 Mar 1800 at Fryeburg, Oxford Co, Maine and died in 1878 in Michigan; 4.Robert Mears Abbott b. 2 June 1802 in Maine and died 14 July 1885 at Carson City, Montcalm Co, Michigan, married Hannah Sherman 1 Nov 1836 at London, Ontario, Canada. Robert & Hannah's children were born at Walsingham, Norfolk, Ontario.