NOTE: "Sr " should not be a suffix in wife Christina's name:
1930: Corcoran Township, Hennepin Co., Minnesota; Benjamin G Kienitz Sr. Head 38 Minnesota Christina A Kienitz Sr. Wife 33 Minnesota Walter B Kienitz Son 13 Minnesota Mamie C Kienitz Dau 9 Minnesota Mirtle M Kienitz Dau 7 Minnesota Donald W Kienitz Son 6 Minnesota Bemjmin C Kienitz Jr. Son 3 Minnesota Christina M Kienitz Jr. Dau 1 Minnesota
1940: Corcoran Township, Hennepin Co., Minnesota; Ben Kienitz Head 48 Minnesota; Christine Kienitz Wife 43 Minnesota; Walter Kienitz Son 23 Minnesota; Mayme Kienitz Dau 19 Minnesota; Myrtle Kienitz Dau 17 Minnesota; Donald Kienitz Son 16 Minnesota; Ben Kienitz Son 13 Minnesota; Christine Kienitz Dau 11 Minnesota; William Kienitz Son M 9 Minnesota
Minnesota, County Marriages, 1860-1949; Name Benjamin G Kienitz; Event Type Marriage; Event Date 24 Nov 1915; Event Place Hennepin, Minnesota; Age 24; Birth Year (Estimated) 1891; Spouse's Name Christina A Oeffling; Spouse's Age 19; Spouse's Birth Year (Estimated) 1896; Page 54; "Minnesota, County Marriages, 1860-1949," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VKNB-163 : 12 March 2018), Benjamin G Kienitz and Christina A Oeffling, 24 Nov 1915, Hennepin, Minnesota, United States; citing p. 54, local historical societies and universities, Minnesota; FHL microfilm 1,380,416.
United States World War I Draft Registration Cards, 1917-1918; Name Ben Kienitz; Event Type Draft Registration; Event Date 1917-1918; Event Place Hennepin County, Minnesota; Nationality United States; Birth Date 09 Nov 1892; Birthplace Corcoran, Minnesota; "United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K87N-7R1 : 13 March 2018), Ben Kienitz, 1917-1918; citing Hennepin County, Minnesota, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,675,469.
United States World War II Draft Registration Cards, 1942; Name Benjamin G Kienitz; Event Type Draft Registration; Event Date 27 Apr 1942; Event Place Corcoran, Hennepin, Minnesota; Age 50; Complexion Light; Employer Self; Birth Date 09 Nov 1891; Birthplace Hennepin, Minnesota; Relative's Name Benjamin Kienitz Eye Color Blue Hair Color Gray Height 5' 4" Weight 142; "United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKCC-WWN6 : 13 October 2017), Benjamin G Kienitz, 27 Apr 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
Have you taken a DNA test? If so, login to add it. If not, see our friends at Ancestry DNA.