Thomas was a son of Pleasant Martin and Rebecca Joplin, of Albemarle county, Virginia. Thomas married Mary Brisco Boyd Bryan, and they had at least seven children. A genealogical study published in the Times Dispatch of Richmond, Virginia in 1912 notes the children as being: John (living in Nashville, Tennessee in 1912), Rebecca, Charles (had married Cornelia Childress and lived in Nashville, Tennessee at the time), Pleasant, Ferdinand (also known as Thomas Ferdinand), Frederick, and Elizabeth.
 The Cabells and Their Kin: A Memorial Volume of History, Biography, and Genealogy Alexander Brown January 1, 1895 Houghton, Mifflin & Company: Wife, Child page 394
"Tennessee Deaths and Burials, 1874-1955," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F6RQ-FXL : 10 February 2018), Thos Martin in entry for Thomas Ferdinand Martin, 11 Jul 1904; citing Nashville, Davidson, Tennessee, reference v O rn 1084; FHL microfilm 1,276,590.
U.S., Sons of the American Revolution Membership Applications, 1889-1970. Volume: 327. Application for Robert Preston Barry, Jr., descendant of Pleasant Martin.
Lineage Book: NSDAR: Volume 059: 1906. Publisher: Ancestry.com Operations, Inc.
It may be possible to confirm family relationships with Thomas by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: