John Fisher Adair m. Talitha Brantley on 13 Aug 1811 (Morgan County Marriage Book 11, p. 53). She died within 5 years. John Fisher Adair then m. Mary Radvel Slavin 21 Oct 1815 (Morgan County Marriage Book 11, p. 118). His third wife is listed in most texts only as the widow Crews. There seems to be a listingfor him and her in the 1840 census which shows him with a wife a 6 children. (Mary Slavin Adair died 25 Jan 1835):
1840 census, Henry Co., AL (Distr. 888), p. 360 Adair, John F.1-2-1-0-0-0-12-0-0-0-0-1
Note that Zephaniah Estes is listed on the same census page. He is the father of Bailey Estes who m. John Fisher Adair's daughter Talitha.