I am just beginning my search and have only a picture of Lee, Glenn, Ray and George Koppenhaver farming in Iowa.
George was born about April 1897, married Lottie Lee Hawk in September 1914. He died in January 1958.
I have connected with the Hawk family background and they have listed George as a Copenhaver, however I have known him as Koppenhaver.
I don't have any more information on his brothers in the picture, Glenn, Ray and Lee.
George's parents were William Eugene Koppenhave and Ida Mayer but I haven't been able to confirm this.