Note: This is just one of 1,164 family groupings listed on The Political Graveyard web site. These families each have three or more politician members, all linked together by blood, marriage or adoption.

These groupings — even the names of the groupings, and the areas of main activity — are the result of a computer algorithm working with the data I have, not the choices of any historian or genealogist.

	John Peter Van Ness (1770-1846) — also known as John P. Van Ness — of New York; Washington, D.C. Born in Claverly (now Ghent), Columbia County, N.Y., 1770. Democrat. U.S. Representative from New York 6th District, 1801-03; mayor of Washington, D.C., 1830-34. Dutch ancestry. Slaveowner. Died in Washington, D.C., March 7, 1846 (age about 75 years). Entombed in mausoleum at Oak Hill Cemetery, Washington, D.C.   Relatives: Brother of William Peter Van Ness and Cornelius Peter Van Ness.   Political family: VanNess family of New York City, New York.   See also congressional biography — Govtrack.us page
	William Peter Van Ness (1778-1826) — also known as William P. Van Ness — Born in Claverack, Columbia County, N.Y., February 13, 1778. Lawyer; U.S. District Judge for New York, 1812-14; U.S. District Judge for the Southern District of New York, 1814-26; died in office 1826. Dutch ancestry. Served as second to Aaron Burr, during his duel with Alexander Hamilton, 1804. Died in New York, New York County, N.Y., September 6, 1826 (age 48 years, 205 days). Burial location unknown.   Relatives: Brother of John Peter Van Ness and Cornelius Peter Van Ness.   Political family: VanNess family of New York City, New York.
	Cornelius Peter Van Ness (1782-1852) — also known as Cornelius P. Van Ness — of Burlington, Chittenden County, Vt.; New York, New York County, N.Y. Born in Kinderhook, Columbia County, N.Y., January 26, 1782. Democrat. Lawyer; postmaster at Burlington, Vt., 1809-14; U.S. Attorney for Vermont, 1810-13; U.S. Collector of Customs, 1813; member of Vermont state house of representatives, 1820-21; chief justice of Vermont Supreme Court, 1821-23; Governor of Vermont, 1823-26; U.S. Minister to Spain, 1829-36; delegate to Democratic National Convention from Vermont, 1840; U.S. Collector of Customs, 1844-45. Dutch ancestry. Died in Philadelphia, Philadelphia County, Pa., December 15, 1852 (age 70 years, 324 days). Interment at Oak Hill Cemetery, Washington, D.C.   Relatives: Brother of John Peter Van Ness and William Peter Van Ness; father of James Peter Van Ness.   Political family: VanNess family of New York City, New York.   Cross-reference: Daniel Kellogg   See also National Governors Association biography — Wikipedia article — U.S. State Dept career summary — Find-A-Grave memorial   Image source: Men of Vermont (1894)
	James Peter Van Ness (1808-1872) — also known as James P. Van Ness — of New Orleans, Orleans Parish, La.; San Francisco, Calif.; San Luis Obispo, San Luis Obispo County, Calif. Born in Burlington, Chittenden County, Vt., 1808. Lawyer; mayor of San Francisco, Calif., 1855-56; member of California state senate, 1871. Dutch ancestry. Died in San Luis Obispo, San Luis Obispo County, Calif., December 28, 1872 (age about 64 years). Original interment at Laurel Hill Cemetery (which no longer exists), San Francisco, Calif.; reinterment to unknown location.   Relatives: Son of Cornelius Peter Van Ness; father-in-law of Frank McCoppin.   Political family: VanNess family of New York City, New York.   See also Wikipedia article — NNDB dossier
	Frank McCoppin (1834-1897) — of San Francisco, Calif. Born in County Longford, Ireland, July 4, 1834. Democrat. Mayor of San Francisco, Calif., 1867-69; postmaster at San Francisco, Calif., 1894-97. Died, of stomach cancer, in San Francisco, Calif., May 26, 1897 (age 62 years, 326 days). Burial location unknown.   Relatives: Son-in-law of James Peter Van Ness.   Political family: VanNess family of New York City, New York.