I believe your John Kappes married my GG Aunt, Ida E. Peirce. Below is some info I have on John and Ida. I have Kappes obits; email me if you'd like copies.
IDA ELIZABETH PIERCE, born September 8, 1884 in Wisconsin , died February 25, 1933 in Havre Montana (48 years), buried Highland Cemetery, Havre, Space D, Lot 42, Block 20, married on January 25, 1905, John William Kappes of Stockton, Illinois, born September 27, 1882, in Illinois to German parents, died June, 1952. Children:
MARIE KAPPES, born December 8, 1906, in North Dakota, died December 1995 in Montgomery, Alabama, married Marion L. Bear, born February 6, 1906, died November 4, 1968, age 62, Kalispell, Flathead County, Montana.
HOWARD KAPPES, born on Aug. 26 1911, in Stirum, North Dakota, died Monday, March 10, 1986, age 74 years, in Havre, MT, buried in Highland Cemetery, Havre, MT, Space 88, Block 33, married, on December 27, 1951 in Boise, Idaho, to Genie Bitsianes. Children: JOHN N. KAPPES, born August 1, 1926, died December 20, 1964, age 38, in Missoula, Montana. Married or separated at time of death; DAVID KAPPES, Havre, Montana;
BERNARD C. (BUZZ) KAPPES , born December 24, 1914, in Kremlin, Montana, died February 17, 1989, Miles City Montana, age 74, buried in the veterans section, Custer County Cemetery, Miles City, married on August 5, 1942, to Louise Wilkins, in Kalispell, born UNK, died after 1989. Children: PRESTON M. KAPPES, living in West Jordan, Utah in 1989, and still listed in online phonebook as living there in 2002; LEON KAPPES, living in Elko, Nevada in 1989.
DAUGHTER KAPPES, born UNK, died before 1989.