John Quincy Adams II was the son of Charles Francis Adams, Charles Adams and Abigail Brown Brooks Abigail Brooks and , the grandson and namesake of President John Quincy Adams and the great-grandson of President John Adams.
He graduated from Harvard University in 1853, studied law, attained admission to the bar, and practiced in Boston. He later established an experimental model farm near Quincy, Massachusetts. Adams married Frances (Fanny) Cadwalader Crowninshield (1839–1911), daughter of George (1812–1857) and Harriet Sears Crowninshield (1809–1873) of the politically powerful Crowninshield family.
22 Sep 1833: born in Washington, District of Columbia.
14 Aug 1894: died in Quincy, Massachusetts.
His son "George Caspar Adams was a former head coach of the Harvard University football program from 1890 to 1892. From 1890 to 1892, he co-coached with George A. Stewart, another Harvard graduate."
verify wikipedia sources, better write up,
↑ "United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX6M-4X8 : 12 April 2016), John Adams in household of L Gardner, Washington, ward 3, Washington, District of Columbia, United States; citing family 250, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Browning, Charles Henry. Americans of Royal Descent: A Collection of Genealogies of American Families Whose Lineage is traced to the Legitimate Issue of Kings. Philadelphia: Porter & Costes, 1891, ed. 2, pp. 68 – 69. Online at https://catalog.hathitrust.org/Record/009792428
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: