Sarah Harding Blanchard
not in ULAN, LCNAF, or found using google
On March 26, 1879, 239 Beacon was purchased from Frederick Whitwell by a trust established under the will of John Adams Blanchard for the benefit of his daughter, Helen Weld (Blanchard) Haynes, the wife of Henry Williamson Haynes. It became Henry and Helen Haynes’s home.
Henry W. Haynes was an archeologist and former professor of Latin and Greek at the University of Vermont.
Helen Haynes died in July of 1902. Henry Haynes continued to live at 239 Beacon, joined by his wife’s unmarried sister, Sarah Harding Blanchard. She previously had lived at The Abbotsford at 188 Commonwealth.
Henry Haynes died in February of 1912 and Sarah Blanchard moved soon thereafter to Brookline.
https://backbayhouses.org/239-beacon/; accessed 5/19/2021
Her mother also named Sarah Harding Blanchard died in 1846, possibly in child birth, in Dorchester, MA so putting Dorchester as this Sarah's birth place. Was unable to find death date or place. https://www.findagrave.com/memorial/189612508/sarah-blanchard