Mary Day was the daughter of Margaret Robinson, not Mary Robinson. See discussions in the biographies for Margaret and for Mary for the reasons for the confusion and why Benjamin Day's wife was Margaret Robinson, not Mary.
Mary Day, daughter of Benjamin Day and his wife Margaret (Robinson) Day was born in Attleboro, Bristol, Massachusetts on Attleboro, Bristol, Massachusetts, United States upon the 28th of December.
Some say she was born in the year 1717, but the sources for that statement need verification by reference to original records.
On 17 February 1738/9, James Jilson (or Jelson) and Mary Day, both of Attleboro, filed their intent to marry.
Some say that Mary died in Killingly, Windham, Connecticut, but that information is open to question and needs to be supported by reference to more reliable sources.
↑ "Attleboro, Births, Marriage Intentions, Marriages, Burials and Deaths, 1694-1890", Massachusetts, Town and Vital Records, 1620-1988, p. 30 (Ancestry.com image 30 of 342, 1 Jul 2016) gives date as 28 Dec 17__, mother's name as Margaret Robinson Vital Records of Attleborough, p. 95 gives same date but names Mary as mother
↑ Cutter, New England Families, Vol. 4 -- page number needed, information cannot be found in source as cited
↑Mary Day, Memorial #54796349, created by Noname, 20 July 1910, Find A Grave. Accessed 4 July 2016 NOTE: Lacks photograph, lacks any documentation, appears to be ignorant of her marriage, should be considered highly unreliable
Cutter, William Richard. New England Families Genealogical and Memorial. Vol. I-IV. (New York, USA: n.p., 1915), Vol. 4 NOTE: needs page number, other means of locating information cited; Benjamin Day, James Jillson, nor George Robinson could be found in Search on this source at Ancestry..com, nor on Google Books
Vital records of Attleborough, Massachusetts, to the End of the Year 1849. (Salem, Massachusetts: Essex Institute, 1934). On-line at ,  (both free sites) or  (pay site)
Jay Byrne, firsthand knowledge. Click the Changes tab for the details of edits by Jay and others.
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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 (beta) of DNA with Mary: