FamilySearch gives his birthplace as West Hartford, Hartford, Connecticut and death place as Westmoreland, Oneida, New York. No sources given.
Birthplace is listed as Connecticut on 1850 and 1855 Census records. Cordelia (Seymour) Hart gives her father's birthplace as Connecticut on the 1880 Census.
Same person?
"United States Census, 1810," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XH26-YTH : accessed 5 May 2020), Aaron Seymour, Boyle, Ontario, New York, United States; citing p. 638, NARA microfilm publication M252 (Washington D.C.: National Archives and Records Administration, n.d.), roll 33; FHL microfilm 181,387.
"United States Census, 1820," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHLB-FK5 : accessed 5 May 2020), Aaron Seymour, Perinton, Ontario, New York, United States; citing p. 349, NARA microfilm publication M33, (Washington D.C.: National Archives and Records Administration, n.d.), roll 62; FHL microfilm 193,717.
"United States Census, 1830," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHP3-BFT : 29 July 2017), Aaron Seymore, Perinton, Monroe, New York, United States; citing 79, NARA microfilm publication M19, (Washington D.C.: National Archives and Records Administration, n.d.), roll 94; FHL microfilm 17,154.
Note: Boyle became Perinton by 1820 and Monroe County was split from Ontario by 1830 so this person probably remained in the same location.
Walter has patent in same section.
MI0620__.367 PatenteeSEYMOUR, WALTER R 4/15/1837 15840 MI Michigan-Toledo Strip 002N - 004E SW¼SW¼ 14 Livingston
002N - 004E NE¼SW¼ 14 Livingston
The same is true slightly later in Caledonia Twp. :
MI1680__.264 PatenteeSEYMOUR, AARON 9/5/1838 785 MI Michigan-Toledo Strip 007N - 003E W½NW¼ 10 Shiawassee
Walter: MI1670__.316 PatenteeSEYMOUR, WALTER R 9/5/1838 324 MI Michigan-Toledo Strip 007N - 003E W½SW¼ 3 Shiawassee
007N - 003E SE¼ 4 Shiawassee
Aaron and Walter appear as heads of household on the 1840 Census at Caledonia, Shiawassee, Michigan. No Aaron Seymour appears in Michigan on the 1850 Census.
However, in 1850 at Westmoreland, Oneida, New York an Aaron and son Charles are in the household of Zenas Howes. Aaron has no occupation.
In 1855 Aaron is residing the same place in a hotel with son Charles. Aaron's occupation appears to be Domestic and Charles is a clerk. Both have been in city/town 2 years.
Aaron Seymour is listed as father on Cordelia (Seymour) Hart's death record.
"Michigan Deaths, 1867-1897," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3XK-Y94 : 2 April 2020), Aaron Seymorer in entry for Cordelia M. Hart, 16 Nov 1886; citing p 127 rn 3366, New Haven, Shiawassee, Michigan, Department of Vital Records, Lansing; FHL microfilm 2,363,632. [Note - possibly not the correct Aaron Seymour. He is linked on FamilySearch.]
Cordelia's mother is listed as Matilda - this does not appear to be the same person as Maria Bishop who shares a grave marker with Aaron Seymour.
Find a Grave, database and images (https://www.findagrave.com : accessed 13 April 2020), memorial page for Maria Bishop Seymour (6 Dec 1797–8 Sep 1835), Find a Grave Memorial no. 69228646, citing Green Lawn Cemetery, New Hartford, Oneida County, New York, USA ; Maintained by DBT (contributor 46622280) .
MAY have had three wives: Matilda (Unknown); Abigail Dowd and Maria Bishop.
Possibly more than one Aaron Seymour?
Sources
"United States Census, 1840," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHYX-W2X : 15 August 2017), Walter R Seymour, Caledonia Township, Shiawassee, Michigan, United States; citing p. 190, NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.), roll 210; FHL microfilm 14,797.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCBL-Y9W : 4 April 2020), Aaron Seymour in household of Zenas M Howes, Westmoreland, Oneida, New York, United States; citing family 616, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K67P-NL3 : 13 March 2018), Aaron Seymour in household of J Milton Buel, E.D. 2, Westmoreland, Oneida, New York, United States; citing p. 10, line #17, family #91, county clerk offices, New York; FHL microfilm 1,435,054.
Find a Grave, database and images (https://www.findagrave.com : accessed 13 April 2020), memorial page for Aaron Seymour (9 May 1789–28 Feb 1860), Find a Grave Memorial no. 69228645, citing Green Lawn Cemetery, New Hartford, Oneida County, New York, USA ; Maintained by DBT (contributor 46622280) .
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DNA Connections
It may be possible to confirm family relationships with Aaron by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Denny Seymour :
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-BY3298, FTDNA kit #108347 +
Y-Chromosome Test 419 markers, haplogroup R-Y20344