Here's the death record of Ada Long, daughter of Milton Long and Lucy Jane Doub.
"North Carolina Deaths, 1931-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FPQV-1MR : 17 July 2017), Ada Victoria Long, 08 Nov 1970; citing Greensboro, Guilford, North Carolina, v 38B cn 38642, State Department of Archives and History, Raleigh; FHL microfilm 1,983,486.
And here are Milton, Lucy J (b 1853, not 1821/2) and Ada in the 1880 census; clearly a much younger woman than Lucy Newsome Doub:
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MC65-9QV : 19 February 2021), Luce J Long in household of Milton Long, Old Richmond, Forsyth, North Carolina, United States; citing enumeration district ED 73, sheet 290B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,963.