I am only going by what is on family search so they are estimates. but his mother died before 1900
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3T6-RQP : accessed 25 May 2017), John Chastain, Chattooga Township, Oconee, South Carolina, United States; citing enumeration district (ED) 67, sheet 7B, family 147, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,537.