Hi. I'm not related to this family, but I can hopefully provide you with some leads.Here is possibly the Klar family in 1940:
1940 United States Federal Census about Edward M Klar Name: Edward M Klar Respondent: Yes Age: 72 Estimated Birth Year: abt 1868 Gender: Male Race: White Birthplace: Illinois Marital Status: Married Relation to Head of House: Head Home in 1940: Clinton, DeWitt, Illinois View Map Street: N Elm Street House Number: 522 Farm: No Inferred Residence in 1935: Clinton, DeWitt, Illinois Residence in 1935: Same Place Sheet Number: 14A Number of Household in Order of Visitation: 319 Household Members: Name Age Edward M Klar 72b. 1868 Illinois; Pensioner Flora Klar 62 -wife- b. 1878 Ill Ralph Klar 35 -son- b. 1905 Ill; Meat Cutter Bernice Klar 29 -dau- b. 1911 Ill; Clerk - WPA Cesil Klar 25 -son- b. 1915 Ill; Laborer Dorothy Klar 21 -dau- b. 1919 Ill; Laborer
There were other children, as well, as shown in the 1920 Census:
1920 United States Federal Census about Edward M Klar Name: Edward M Klar Age: 51 Birth Year: abt 1869 Birthplace: Illinois Home in 1920: Clinton Ward 2, DeWitt, Illinois Race: White Gender: Male Relation to Head of House: Head Marital Status: Married Spouse's Name: Flora Klar Father's Birthplace: Ohio Mother's Birthplace: Ohio Home Owned: Own Able to Read: Yes Able to Write: Yes Household Members: Name Age Edward M Klar 51b. 1869 Ill, parents b. OH; Carpenter, Rail Road Flora Klar 42 -wife- b. 1878 Ill, fath b. OH, moth b. Miss Wilbur E Klar 17 -son- b. 1903 Ill Ralph J Klar 15 -son- b. 1905 Ill Edward H Klar 9-son- b. 1911 Ill Vinnie J Klar 7-dau- b. 1913 Ill Cecil A Klar 5-son- b. 1915 Ill Dorothy Klar 1-dau- b. 1919 Ill
There is a tree on Ancestry.com for son, Wilber. His full name was Wilber Everette Kar, b. 8 Jan 1903 Clinton, Ill., d. Apr 1983 Aurora, Kane, Ill.He was married to Blanche Adele Seats and they had at least 2 children.
Here is Wilbur in 1940:
1940 United States Federal Census about Wilbur E Klar Name: Wilbur E Klar Age: 37 Estimated Birth Year: abt 1903 Gender: Male Race: White Birthplace: Illinois Marital Status: Married Relation to Head of House: Head Home in 1940: Thornton, Cook, Illinois View Map Street: Center Street House Number: 16420 Farm: No Inferred Residence in 1935: Harvey, Cook, Illinois Residence in 1935: Harvey, Cook, Illinois Sheet Number: 2B Number of Household in Order of Visitation: 39 Household Members: Name Age Wilbur E Klar 37b. 1903 Ill; Machinest, Machine shop Blanche Klar 32 -wife- b. 1908 Ill Betty Jane Klar 13 -dau- b. 1927 Ill Dixie Lou Klar 4-dau- b. 1936 Ill
As for Ralph, there was a marriage announcement for him in the Decatur Evening Herald, 10 Apr 1929 - "CLINTON April 10 - Miss Lela Provina? and Ralph Klar, bother of Clinton were united in marriage in Champaign Friday Evening... Mr. Klar has taken a position in the Sanitary meat market. Mrs. Klar is a daughter of Mrs Maud Fay (or Fry) 215 North Alexander Street.She was born in Dewitt County... Mr. Klar is a son of Mr and Mrs Edward Klar 512 North Elm street."