William Steuben Smith (1787–1850) was a nephew of JQA (being the son of Abigail [Adams] Smith) as well as the brother-in-law of LCA, having married Catherine Maria Frances Johnson in 1813 at St. Petersburg. He had been serving as private secretary to JQA, then minister to Russia, while Catherine had accompanied her sister to that distant land. To distinguish this couple from numerous other Smiths, CFA often called them “Uncle Smith” and “Aunt Smith.” See Adams Genealogy; Bemis, JQA , 1:154–155, 238.