Part II: Sarah Tiffin is found in Census data with children Arthur etc. Data says she was b. in AL.
Sarah F. Tiffin and children in OK
https://familysearch.org/search/record/results?count=20&query=%2Bsurname%3ATiffin~%20%2Bbirth_place%3Aok~%20%2Bbirth_year%3A1880-1903~%20%2Bfather_givenname%3Aedward~%20%2Bfather_surname%3Atiffin~%20%2Bmother_givenname%3Asarah~
There is an Isaac Newton McCullough that married Delphia Jane Stanphill in Miss, then resided in AL by 1860. This may be the McCullough/Stanfill connection, but would require more research. Or maybe someone can find the family in 1870-1880 census of this couple?
SOURCE: Mississippi, Marriages, 1800-1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V2ZG-RR1), Isaac Mc Cullock and Delphia Jane Stanphill, 30 Dec 1855; citing Itawamba,Mississippi; FHL microfilm 901,648.
Isaac Mc Cullock
Spouse: Delphia Jane Stanphill
Marriage: 30 Dec 1855 : Itawamba,Mississippi
SOURCE: "United States Census, 1860," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHDL-LFG), Isaac Mc Culloch, The Western Division, Franklin, Alabama, United States; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing p. 119, household ID 811, NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 803,010.
Isaac Mc Culloch M 32 AL
Delphia J Mc Culloch F 23 AL
Wm J Mc Culloch M 4 AL
Elizabeth J Mc Culloch F 2 AL