Edwin J (EJ) BARTLETT b 1853 SC is in 1880 Mecklenburg, NC census; near his sister Harriet "Hattie" PIGFORD b 1845 SC. Delesline BARTLETT b 1835 SC is in Lee Co, AL in 1880, later living in Muscogee Co, GA.
These are all children of Edwin J "EJ" BARTLETT b 1811 SC & Emma P _____ b 1818 SC who are in 1850 Sumter Co, SC census, where E J is a Sadler (NB Delesline is listed variously as a Harnessmaker, Carriage Maker and Carriage Trimmer)
EJ's son in 1850 is Charles BARTLETT b 1838 SC (gone by 1860); I believe Charles is Charles 30 Wheelwright b NC in 1870 Barbour Co, AL; and Robert C BARTLETT 42 CarriageMaker b SC in Oconee Co, SC and in 1900 Greenville Co, SC (with a son Edwin). However in 1880, 1900 and 1910 Robert C lists his father as b MD; whereas the siblings above say their father was b SC.
DNA from a descendant of Robert C BARTLETT matches two others: one probably from Pitt Co, NC and one from Kent, England in early 1800s - GO FIGURE!
I hope someday, someone discovers more about Edwin J "EJ" BARTLETT b 1811; and/or that we get matching DNA from another distant cousin, which will provide more clues.