1.  Elliott, Katherine B.  1963/1984.  Marriage Records, 1765-1810, Mecklenburg Co., VA.  South Hill, VA (copy in Johnston County Public Library, Smithfield, NC).  On p. 167:

Marriage Bond 30 Sept 1816 in Mecklenburg Co. VA for Henderson Thompson and Mary A. Tucker.  Surety:  Thomas Burnett. Consent:  Daniel Tucker, father of Mary.  Consent:  John Thompson, Jr., father of Henderson.

2.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

Henderson THOMPSON Spouse: Mary A. TUCKER Marriage: 01 Oct 1816, Warren, North Carolina Source: patron submissions

Henderson THOMPSON Birth: About 1797, Mecklenburg, Virginia Father: John THOMPSON; Mother: Mrs. John THOMPSON Spouse: Mary A. TUCKER Birth: About 1797, Mecklenburg, Virginia Father: Daniel TUCKER; Mother: Mrs. Daniel TUCKER Marriage: 30 Sep 1816, Mecklenburg, Virginia Source: patron submissions

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3.  A Henderson Thompson is mentioned as a grandson in the Will of John Thompson, Sr., dated 1829. 

4.  Email from Hilda Hood.

A.   We have a slight problem with son Henderson's age.  Even if we grant that his father's marriage to Nancy Burnett was a "shotgun" wedding with Henderson born shortly thereafter (in 1801), Henderson would still have been only 14 or 15 years old when he married in 1816.  It's not impossible for Henderson to have married so young, but it raises a red flag suggesting his father may have had an earlier wife.  The fact that John was 26 or 27 years old when he married Nancy makes an earlier wife quite possible.  On the other hand, the fact that Thomas Burnett gave surety suggests Nancy was his mother.