My database notes show him to be the 2nd of 7 children born to James Abernathy and Nancy Coker, md 2 Mar 1828 in Jefferson Co, AL. She was evidently a daughter of William Coker, b. abt 1815, d. between 1870-1880. Her husband was a son of David Wilson Abernathy (b. 1767 in NC, buried Abernathy Cemetery, Lacey's Chapel, now Bessemer, AL) and his wife Ruth.
This is collected and unverified information only. I have not yet researched this line.