Looking for Ancestor of Elizabeth "Lizzie" A. (Blackwell) Duke

Looking for Ancestor of Elizabeth "Lizzie" A. (Blackwell) Duke
Her father was Samuel L. "Sam" Blackwell and I'm unsure on her mother...possibly Mary Ann Elizabeth (Readan/Regon/Reagins/Ragan/Rogan)

James “Jim” DUKE ____________________________ (bef. 1886) , b. 1 Mar 1864 ______________________________ Missouri, d. 15 Mar 1936 at daughter Lucy’s home, Bartlesville, Washington County, Oklahoma, bur.16 Mar 1936 in White Rose Cemetery, Lot 1, Block 29, Bartlesville, Washington County, Oklahoma,

m. Elizabeth “Lizzie” A. BLACKWELL (d/o Sam BLACKWELL) on 18 Sep 1845 _______________________, Lincoln County, Tennessee, b. 16 Feb 1868 __________________________________ Missouri, d. 30 Sep 1905 Carterville, Jasper County, Missouri, bur.Carterville Cemetery, Jackson’s First Addition Section, 2A, Lot # 110, Carterville, Jasper County, Missouri

James “Jim” DUKE appeared in the census on 29 Jun 1870 in Wright County, Missouri (Hartville, Missouri Post Office).He was buried by McCallister Funeral Home, Bartlesville, Washington County, Oklahoma.Listed widowed at the time of his death.He died from Influenza with onset on 1 Mar 1936.

Elizabeth “Lizzie” A. BLACKWELL appeared in the census in 1870 in Barry County, Missouri.She appeared in the census in 1880 Wright County, Missouri.She appeared in the census in 1900 in Aurora, Lawrence County, Missouri.

Any help appreciated.
Jodie