Hi Kat,
I have sent you a PM for your email address please, as I have located an article about Mark from 1959, quality is so, so, buts its readable and I would be really happy to send it on to you.
Mark Edward Blankenstein
https://www.findagrave.com/memorial/66109169/mark-edward-blankenstein
1940 Census: Ward 4, Natchez, Beat 1, Adams, Mississippi
James Vernon Head Male 27 Alabama
Marie Vernon Wife Female 27 Arkansas
Leon Vernon Son Male 3 Mississippi
Mary Booker Mother-in-law Female 60 Arkansas
Fay Booker Sister-in-law Female 23 Arkansas
David L Holt Uncle-in-law Male 59 Arkansas
Adriane Blankenstein Lodger Female 28 Mississippi
Mark Blankenstein Son Male 6 Mississippi
Source: "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VYLG-CVB : 27 July 2019), Mark Blankenstein in household of James Vernon, Ward 4, Natchez, Beat 1, Adams, Mississippi, United States; citing enumeration district (ED) 1-11, sheet 14B, line 75, family 312, 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 2005.
1910 Census: Helena Ward 3, Phillips, Arkansas.
W A Beauchamp Head Male 29 Louisiana
Edith Beauchamp Wife Female 26 Mississippi
Nina Beauchamp Daughter Female 3 Mississippi
Adrian Beauchamp Daughter Female 1 Mississippi
Source: "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKV2-LQT : accessed 19 December 2019), Adrian Beauchamp in household of W A Beauchamp, Helena Ward 3, Phillips, Arkansas, United States; citing enumeration district (ED) ED 106, sheet 3B, family 51, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 60; FHL microfilm 1,374,073.
1920 Census: Natchez Ward 2, Adams, Mississippi
W A Beauchamp Head Male 38 Louisiana
Edith D Beauchamp Wife Female 36 Mississippi
Nina Beauchamp Daughter Female 13 Mississippi
Adriene Beauchamp Daughter Female 11 Mississippi
Bertha Beauchamp Daughter Female 3 Mississippi
Wallace Beauchamp Son Male 0 Mississippi
Source: "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNRX-LJX : accessed 19 December 2019), Adriene Beauchamp in household of W A Beauchamp, Natchez Ward 2, Adams, Mississippi, United States; citing ED 8, sheet 1A, line 10, family 3, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 868; FHL microfilm 1,820,868.
Parents marriage:
Wallace A. Beauchamp married Edith S. Terry on 20 Jun 1905 at Jefferson County, Mississippi
Source: "Mississippi Marriages, 1800-1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V2ZP-BRP : 10 February 2018), Wallace A. Beauchamp and Edith S. Terry, 20 Jun 1905; citing Jefferson County, Mississippi; FHL microfilm 893,074.
W. A. Beauchamp and Edith Terry Beauchamp grave:
https://www.findagrave.com/memorial/104092834/edith-terry-beauchamp
Adriene Horne United States Social Security Death Index
Age: 65
Given Name: Adriene
Surname: Horne
Birth Date: 17 Nov 1908
State: Mississippi
Last Place of Residence: Rankin, Mississippi
Previous Residence Postal Code: 39208
Event Date: Dec 1973
Source: "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J1J2-9MX : 20 May 2014), Adriene Horne, Dec 1973; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).