Somehow I never connected Jackson in the 1850 census with Richard. And thank you for the heads up on Anson being Alice.
Flora Ann Cargo was indeed a daughter of Samuel Alexander Cargo and his 1st wife Sarah (Sally) Malcolm. They married Nov 22 1814 in Staunton, Augusta, VA. Samuel's 2nd wife was Narcissa Cornelius (sister of Bailey), whom he married Dec 12 1859 in Blount Co.
Don't suppose you have anything further back on the Yieldings than Richard and Milly?