Mercy was born in 1742. She was the daughter of John Blackmer and Sarah Holmes. She passed away in 1765.
Sources
Mayflower Families Through Five Generations, Silver Books, Volume Eighteen, Part 2, The Descendants of Richard Warren Through His Children Mary, Anna, and Elizabeth, Published 2011, Page 73
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DNA Connections
It may be possible to confirm family relationships with Mercy by comparing test results with other carriers of her ancestors' 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 Mercy: