H. C. deliberately changed his name as a young man to (as he put it) "restore" the "d". This caused some friction with his siblings, although research has gone on to show that the "d" did appear in some of his father's service records.
Family Bible. Originally owned by Henry Clay and Louie (Buck) Simonds. Now in possession of their great-grandson C. Simonds. Provides dates of birth and marriage (entered by Louie) and death.
FindaGrave.com. Henry Clay Simonds. In the late 1990s, a marker was purchased by son Patrick, grandson Charles, and great-great-granddaughter Shari S. H. C. said he did not want a headstone, but the descendants named above felt that this decision was based on the family's lack of money at the time, not on a genuine wish. The photo on the memorial page is of the stone added later, with dates based on the family Bible and death certificate: http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=14710917
Autosomal DNA: Close Relationships. Second cousins once removed, descending from Henry Clay's parents through H. C. and his sister Lillie Maud, share 323 cM and triangulate with other descendants of H. C. through another line. (See F403815, A811862, A862784/A724226 at GEDmatch.) Descendants have Ancestry matches that suggest relationships to both of H. C.'s parents, but this is not yet triangulated.
It may be possible to confirm family relationships with Henry 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: