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"Alabama County Marriages, 1809-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VZVC-N51 : 26 September 2017), Alexander Erskine and Susan Russell, 28 Jun 1820; citing Madison, Alabama, United States, county courthouses, Alabama; FHL microfilm 1,305,696.
Find A Grave, database and images (https://www.findagrave.com : accessed 05 May 2018), memorial page for Dr Alexander Erskine (11 Apr 1791–5 Jul 1857), Find A Grave: Memorial #8765689, citing Maple Hill Cemetery, Huntsville, Madison County, Alabama, USA ; Maintained by Graveaddiction (contributor 46528400) .
It may be possible to confirm family relationships with Alexander by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: