Family tree:

William Harriman, emigrated from England to the United States in 1795
- Orlando Harriman (1790-1867) m. Anna Ingland (1791-1853)
  - Rev. Orlando Harriman Sr. (1813–1881) m. 1842 Cornelia Neilson (1814–1889)
    - John Neilson Harriman (1843-1898) m. Elizabeth Grainger Hancox
      - Joseph Wright Harriman (1867-1949) m. 1892 Augusta Barney (1870-1939)
        Miriam Harriman (1894-1947) m. Geb. Boykin Cabell Wright (1891-1956)
        
        Alan Harriman (1899-1928)
      - John Neilson Harriman (1868-1868)
    - Orlando Harriman Jr. (1844-1911)
    - Annie Ingland Harriman (1846-1920)
    - Edward Henry Harriman (1848–1909) m. 1879 Mary Williamson Averell (1851–1931)
      - Mary Harriman (1881–1934) m. 1910 Charles Cary Rumsey (1879–1922)
      - Henry Neilson Harriman (born 1883)
      - Cornelia Averell Harriman (1884–1966) m. 1908 Robert Livingston Gerry, Sr. (1877–1957)
      - Carol Harriman (born 1889)
      - William Averell Harriman (1891–1986) 1st m. 1915 Kitty Lanier Lawrance (1893-1936), (divorced 1929); 2nd m. 1930 Marie Norton (1903–1970); 3rd m. 1971 The Hon. Pamela Beryl Digby (1920–1997)
        (1) Mary Williamson Harriman (1917-1996) m. 1940 Dr. Shirley Carter Fisk
        
        (1) Kathleen Lanier Harriman (1917–2011) m. 1947 Stanley Grafton Mortimer Jr. (1913-1999)
      - Edward Roland Harriman (1895–1978) m. 1917 Gladys Fries (1896–1983)
        Elizabeth Harriman 1st m. Alexander C. Northrop; 2nd m. Maximillian Bliss, Jr.
        
        Phyllis Harriman m. Frank Herbert Mason (1921–2009)
    - Cornelia Neilson Harriman (1850-1926) m. Charles Dewar Simons (1847-1926)
    - William MacCurdy Harriman (1854-1903)
  - William Harriman (1816-1855)
  - James Harriman (1820-1912) m. Sarah Ann Fotterall (1840-1917)
  - Charles Harriman (1822-1878) m. Helen Margaretta Anderson (1827-1909)
  - Oliver Harriman (1829–1904) m. Laura Low (1839-1901)
    - James Low Harriman m. Elizabeth Templeton Bishop (1865-1934)
      - Oliver Bishop Harriman (died 1926)
      - Mary Bishop Harriman 1st m. Felix Tower Rosen; 2nd m. Pierre Lecomte du Noüy (1883-1947)
    - Emmeline Harriman (1860-1938) 1st m. William Earl Dodge III. (1858-1884); 2nd m. Stephen H. Olin; 3rd m. Howland Spencer
    - Anne Harriman (1861-1940) 1st m. Samuel Stevens Sands Jr. (1856-1889); 2nd m. Lewis Morris Rutherfurd Jr. (1859-1901); 3rd m. 1903 William Kissam Vanderbilt (1849-1920)
    - Oliver Harriman, Jr. (1862-1940) m. 1891 Grace Carley
      - Oliver Carley Harriman
      - John Harriman
      - Borden Harriman
    - Jefferson Borden Harriman (1864-1914) m. 1889 Florence Jaffray Hurst (1870-1967)
      - Ethel M. B. Harriman (1897-1953) m. Henry Potter Russell (born 1893)
    - Joseph Harriman
    - Herbert Melville Harriman (1873-1933) 1st m. 1894 Isabella Hunnewell (1871-1968), (divorced 1906); 2nd m. 1908 Mary Madeline Brady (1866-1930), (divorced 1921); 3rd m. 1921 Sarah Jane Hunter (1891-1933)
    - Lillie Harriman 1st m. William Riggin Travers Jr.; 2nd m. Frederick Christian Havemeyer