Louise Lenz and Oscar Egler of Cook County IL

I am researching the family of Oscar Egler born 1885 in the Dakota Territory (now North Dakota) and died 1955 in Cook County, IL. Oscar first married Matilda Louise Lenz born 1888 in Germany and died 1972 in Melrose Park, Cook Co.,IL. At the time of her death, Louise was residing with her daughter Marjorie Egler Kuhlman. Marjorie born 1918 in Cook Co., Il married Fredrick A. Kuhlman in 1950. The couple resided in Melrose Park, IL, Marjorie died in 1999 and Fred died in 2002. The Kuhlmans had a son Steven who I would very much like to contact in regard to the Egler/Lenz family history. Thank you