Not sure this will ever get straight? Here I go! The Margaret Tiffin you have in 1880 MS married S. J. Wood, 24 Jan 1895 in Franklin, AL. John Tiffin wed "Leaner" McCullouch 30 Dec 1894 also in Franklin, AL. So the wife you are focusing on in 1900 and 1910 Oklahoma was actually maiden name, McCullouch/McCullough. Their son, Sidney M. Tiffin died 12 Sep 1954 in San Joaquin, CA. His mother's surname identified as McCullouch. Find the McCullough/McCullouch clan in 1880 AL-Colbert-Bartons-037-Image 21 and 1900 AL-Franklin-Bear Creek-District 22-Image 7. As for the Tiffin brothers, John (age 9 in 1880) appears to have been the husband of Margaret Leanna McCullouch? His brother Wiley was still single in 1910 OK-Beaver-Benton-District 17-Images 7 & 8 with parents and brother William. Not certain of marriage date for John Wesley Tiffin and Viola (nee: Dwight) Simpson but suspect it happened after 1930? Sidney was the informant on his father's death certificate.