Robert Barr Todd and Robert Levi Todd

Robert Barr Todd was the son of David Todd, Mary Todd Lincoln's uncle and brother of her father Robert Smith Todd.  After graduating from the University of Missouri, he eventually got to Louisiana

Robert Levi Todd was the son of Roger North Todd, another brother of Robert Smith Todd. He remained in Columbia for his whole life.

Robert Barr Todd's mother, Elizabeth "Eliza" Barr Todd, married David Todd.  One of his sisters, Rebekah Todd Samuel,  married George Warren Samuel.

--Old Secesh