Dorothy Quincy Hancock's siblings were Edmund, Henry, Elizabeth (1727-bef 1729), Abraham, Elizabeth, Katherine, Jacob, Sarah, and Esther. Her parents were Edmund Quincy (born 6/13/1703 in Braintree, MA - dec. 7/4/1788 in Braintree, MA) and Elizabeth Wendell (born 1704 in New York [don't know if city or state - assume city] - dec. 11/7/1769 in probably Braintree, MA). Her paternal grandparents were Edmund (the family REALLY liked this name) Quincy (born 10/29/1681 in Braintree, MA - dec. 2/23/1737/38 in London, Eng.) and Dorothy Flynt (born 5/11/1678 in ? - dec. 7/27/1737 in Braintree, MA). Her maternal grandparents were Abraham Wendell and Katrina DeKay (only info I have on them).
I have a lot of dates and names of the Quincy family courtesy of my grandmother's research.