vital records sources
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Mercy was probably born in Barnstable, Massachusetts Bay Colony, before her family moved to Middleborough, Massachusetts. She married and spent the rest of her life there. She is referred to as deceased when the heirs of her father drew up an agreement to divide his estate.1 Her three daughters were given her share, which amounted to £4, three shillings. Their uncle Abraham was to pay them within three years of William Barden's decease, with interest.

Children of Mercy Barden and John Miller:2

i. Deborah, b. abt. 1683-4
ii. Mercy, b. abt. 1685-6
iii. Elizabeth, b. 18 February 1688/893

vital records sources: Her birth is in Mayflower Descendant, vol. 3 (), 51.

1. Plymouth Co., MA, deed 3:369.
2. Probate records for William Barden and John Miller list Mercy first, Deborah second and Elizabeth third. Mercy's death record and gravestone put her birth between 28 March 1685 and 28 March 1686. Deborah married on 19 Feb 1706/07 (Massachusetts: Vital Records, 1620-1850 (Online Database: AmericanAncestors.org, New England Historic Genealogical Society, 2001-2016).https://www.americanancestors.org/DB190/i/14012/88/253512848, dual year not given she had a child on 10 Nov 1707). Elizabeth's birth is on record in early 1789.
3. Massachusetts, U.S., Town and Vital Records, 1620-1988 Middleborough Town Records, with Births, Marriages, and Deaths, 97/81, transcribed Massachusetts: Vital Records, 1620-1850 (Online Database: AmericanAncestors.org, New England Historic Genealogical Society, 2001-2016). https://www.americanancestors.org/DB190/i/48349/42/1414826629