Hi!I'm not descended from Elinor and Thomas Jefferson, but from his other wife, Emily Jane Thurman, but I do have information that I can share with you. With Thomas' first wife - Elinor he had 7 children including your ggrandfather.The others are:
Sarah Ann b. 4/26/1826
Elizabeth A. b. 3/28/1828 Harriet E. b.10/8/1830 Frances T. b. 10/8/1830 William D. James Thomas b. ABt 1837 Ambrose Luke b. 4/21/1840
Then Thomas m. Dec 6, 1846 Emily Jane Thurman b. Nov 13, 1821 d. Mar 15, 1906 and their kids are as follows:
Louella Susan b. December 12, 1847 CHARLES FRANCIS FORD b. May 02, 1849 WALTER MITCHELL FORD b. November 16, 1852 JAMES ARCHER FORD b. August 10, 1855 MARY ELIZABETH FORD b. August 10, 1855 JEFFERSON HENRY FORD b. February 18, 1862 ROBERT LEE FORD b. April 25, 1868
I'm descended from Jefferson Henry.
Thomas Jefferson's siblings were as follows:
AMBROSE FORD b. Abt. 1806
DANIEL DUIGUID FORD b. unk WALTER H. FORDb. unk
I hope this helps some.If you need any more info regarding these families or even further back just let me know and I'll be more than happy to share.It's all just so interesting!!