Phoebe Deborah Jackson (b. 28 Dec 1802) is daughter of Ruben Jackson (b.c. 1760) and 1st wife Barbara Dice(m.c. 1799).
Phoebe married Hugh Curlin (b.c. 1800) on 9 Jul 1821 in Wilson Co TN.One of their daughters, Mexico America Curlin (b. 18 Jan 1825) married her first cousin Wilson Terrell Curlin (b.c.1825), son of Seth Curlin (b.6 Mar 1805)and Cynthia Hogan.
Seth and Cynthia had a son Seth Solathiel? Curlin (b. 16 Feb 1849).
Seth Curlin and Hugh Curlin were brothers.
I do not know anything about the connection to Wm. Cobb, sorry.