This is my working hypothesis - the way I see it as of this moment!! 

Children of James Cobb and Elizabeth McGlauhon:
1. Mary Cobb
      married Elisha Ashburn d 1801
2. Henry Cobb 1770 - 1800
      married 1 May 1792 Sarah Kington
       a. Jesse Cobb
             married 16 Aug 1820 Ruthy Colies of Chowan Co
       b. Nancy Cobb
             married 1816 William Steele Jr
       c. Henry K Cobb  d 1830
             married ca 1825 Jeanette Myers
              i. Sarah E [Sally] Cobb 13 Sept 1827 - May 1899
                   married 1 Jan 1851 Joseph Perry
                                       Henry J Britt, Bm
                          1. Zachariah Perry
                          2. Thaddeous Perry
                                 married Annie Daniels
                                  a. George H Perry
                                        married Betty White
             ii. Amanda Cobb 2 May 1829 -
                   married 1870/80 William Lee
             iii. George William Cobb 26 Nov 1834 - 30 Jan 1922
                    married 30 April 1867 Celia Ann Henry d 17 Aug 1900
3. Celia Cobb 1772 - 
     married 5 April 1793 John Shaw
4. Jesse Cobb 1774 -   was in Martin Co by 1800
5. Sarah Cobb 1775 -
      married 14 Oct 1795 David Davis
               Smith Davis, Bm
6. Elizabeth Cobb 1777 -
      married 2 Nov 1796 Elisha Corbett
                Hardy Bowen, Bm
7. Margaret Cobb 1781 -
     married 27 July 1801 Joshua Bowen
                Elisha Corbett, Bm
8. William Cobb est 1783 - 1848
     married Catherine 1784 -
9. James Jr 1786 - 1839
     married Ruth Cowan

Ref: 
"Nicholas Cobb Descendants, Neighbors and Relatives 1613-1983" by Joe H Cobb 1983
                   [his widow still has his books available]