Joan was born in 1931. She was the daughter of Ralph Bunche and Ruth Harris. She passed away in 2015.
Sources
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K73M-YF9 : 15 March 2018), Joan Bunch in household of Ralph J Bunch, Tract 34, District of Columbia, Police Precinct 10, District of Columbia, District of Columbia, United States; citing enumeration district (ED) 1-423, sheet 5A, line 10, family 58, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 567.