So, what are the odds that Quatie Brown Ross is indeed John Lucien Brown's father's sister? They did share other family members. Quatie was a family name for girls from the Bird clan which included John Lucien Brown's mother.

Kinship of John (Chief) Ross
Brown, John B. Husband of the grandniece
Brown, Quatie Wife
Coody, Joseph Brother-in-law
Daniel, Delilah Jane Wife of the grandson
Daniel, Osceola Powell Husband of the granddaughter
Fields, Jennie Daughter-in-law
Hicks, Charles R Husband of the granddaughter
Lowrey, Susan Sister-in-law
McCoy, Margaret Grandniece IV 3
Miegs, Elizabeth Grace Wife of the grandson
Ross, Allen Son I 1
Ross, Allen C Great-grandson III 3
Ross, Elizabeth Granddaughter II 2
Ross, Emma Granddaughter II 2
Ross, Lucinda Granddaughter II 2
Ross, Robert Bruce Grandson II 2
Ross, Rufus O. Grandson II 2
Ross, Susan H. Granddaughter II 2
Ross, Victoria Granddaughter II 2
Ross, Wallace Carter Great-grandson III 3
Ross, William Wallace Grandson II 2
Stapler, Jane Great-granddaughter III 3
Thornton, Fannie Spouse of the grandson
Vann, Elizabeth Great-granddaughter III 3
Vann, John Ross Husband of the granddaughter
Kinship of John Lucien Brown
Brown, John B. Son I 1

Coodey, Elizabeth (Meade) Wife
Daniel, Delilah Jane Wife of the half nephew
Daniel, Osceola Powell Husband of the half niece
Fields, Jennie Half sister II 1
Hicks, Charles R Husband of the half niece
Lowery, Mary (Simpson) Wife
McCoy, Margaret Daughter-in-law
Miegs, Elizabeth Grace Wife of the half nephew
Ross, Allen Half brother-in-law
Ross, Allen C Half grandnephew IV 3
Ross, Elizabeth Half niece III 2
Ross, Emma Half niece III 2
Ross, Lucinda Half niece III 2
Ross, Robert Bruce Half nephew III 2
Ross, Rufus O. Half nephew III 2
Ross, Susan H. Half niece III 2
Ross, Victoria Half niece III 2
Ross, Wallace Carter Half grandnephew IV 3
Ross, William Wallace Half nephew III 2
Stapler, Jane Half grandniece IV 3
Thornton, Fannie Spouse of the half nephew

Vann, Elizabeth Half grandniece IV 3
Vann, John Ross Husband of the half niece

It's not proof, but it is reasonably convincing.