Public trees at Ancestry agree with the dates and parents for John Thomas "Major" Garner
The parents for John Thomas "Major" Garner come from the FAG which has both wives attached.
John Garner
in the Georgia, U.S., Compiled Marriages, 1754-1850
Name: John Garner
Spouse: Nancy Head
Marriage Date: 14 Feb 1811
Marriage County: Elbert
Marriage State: Georgia
https://www.ancestry.com/discoveryui-content/view/18016:2085?ssrc=p...
https://www.familysearch.org/tree/person/collaborate/2Z3B-BWZ
FS says:
Note
Not the father of Jackson George Garner. Was the father of James Jackson Garner who died in 1864. John mentioned by name his surviving four sons in his will.
Last Changed: 9 June 2019 by s
1850 census
Household Role Sex Age Birthplace
John Garner Male 70 North Carolina
Jackson Garner Male 34 South Carolina
David Garner Male 14 Alabama
Bibbs Garner Male 12 Alabama
Mary J Garner Female 18 Alabama
Loritta Garner Female 17 Alabama
Frances Garner Female 13 Alabama
FS
https://www.familysearch.org/tree/person/9646-DFN James Jackson
https://www.familysearch.org/tree/person/LLC6-ZLN Jackson George
The Y haplo attached to the profile is the same regardless of father attached Sturdy F Garner or James Bradley Garner