This is so old, it probably won't do any good for me to reply. My dates and facts are not identical, but I believe I know the same family.
Frederick William Luhman b. 14 Oct 1873, Germany d. 20 Dec 1950 Custer Co., MT
m. Anna Rogge b. ~1876, Germany d. 26 Jun 1936 Custer Co., MT
Children:
Frederick H., b. Jun 1898, WI
Dora M., b. Apr 1899, WI
Walter F., b. ~1904, OK d. 12 Nov 1946, MT
William, b. ~1908, OK
Louis H., b. 1909, OK
Pauline A., b. 1911, OK
Alma M., b. ~1917, MT d. 26 Apr 1934, MT
Leon, b. 8 Oct 1917, MT d. 9 Sep 1976 Custer Co., MT
All were found in U. S. censuses. Both parents have immigration dates from Germany. The father registered for World War I draft. The death dates come from the Montana Death Index, 1907-2002 on Ancestry.com.
Walter's children live in MT.