Mary's birthdate is thought to be about 1795, however no source has been found to support that. This record shows Mary and her brother Peter J. Keller as baptized together in 1805. No birth date is given for either child. They could be twins. That seems more likely than Mary being 10 years old before she was baptized, despite some of her younger siblings being baptized before her!
"LUTHERAN CHURCH RECORD, 1793-1832, Baptism Record of Ebenezer Lutheran Church", Source: Ontario Historical Society, Papers and Records, Vol VI, published by the Ontario Historical Society, 1905, Pg 143,Peter J and Mary, b. unknown, Frederick Keller, et ux. ej Elesabeth, bpt. 1805, https://ontariohistoricalsociety.ca/wp-content/uploads/2020/02/Ontario-History-1905-v6.pdf
"Frederick Keller", Source: United Empire Loyalists Association of Canada, Home Page online publication, Making the Loyalists, Largest Families, Largest Loyalist Families - Frederick Keller, submitted by Arnold Weirmeir, UE, accessed 2021-11-05, https://uelac.ca/trivia/largest-loyalist-families/
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DNA Connections
It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Mary:
Gerri Kellar Fraterrigo. (formerly from New York) She is my first cousin 4x removed.