Dempsey's first wife was Rachel Calvert McMahan and they had three children. His second wife was Orrina (unk) and they had one child.
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/63069759/dempsey-maples : accessed 12 May 2022), memorial page for Dempsey Maples (1808–1899), Find a Grave Memorial ID 63069759, citing Mount Wesley United Methodist Church Cemetery, Jonesborough, Washington County, Tennessee, USA ; Maintained by Ann Bowman (contributor 46831529) .
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCD1-FNL : 23 December 2020), Adempsey Maples, Sevier, Tennessee, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
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DNA Connections
It may be possible to confirm family relationships with Adempsey by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Adempsey: