Unfortunately you didn't name August's wife, but there are a couple of Ponath names found in my index: Henrietta (Ponath-Logemann), August, Augusta, Harry, Johanna, Margaretha, Wilhelm, Fred, Ida Luther (née Ponath).
Look-ups available:
gary.rebholz@gmail.comMilwaukee's German Newspapers; an index of death notices and related items (1844-1950).