+———George Washington Cowan  |      Naomi Gertrude Cowan (1885 Ogle Co, IL – )  |          |   +———Andrew W. Slifer (6 Jun 1829 MD – 1896 Mt. Morris, Ogle Co, IL)  |   |  +———Elizabeth Slifer (28 Mar 1859 Washington Co, MD – )      |              |   +———Henry Row (1784 Lancaster Co, Pensylvania – 1876 Franklin Co, PA)      |   |      +———Maria Ann Row (13 Mar 1836 Washington Co, MD – 16 Sep 1916 Mt. Morris, Ogle Co, IL)          |                  |   +———Joseph Zimmerman          |   |          +———Sarah Zimmerman (18 Aug 1799 Washington Co, MD – 25 Jun 1852)              |                  +———Anna Hershberger