Fredrick Peterson, the third son of Peter and Catherine was born Feb. 2, 1884 and married Mabel Westaby in 1911. Their two children are Leonard, born May 11, 1913 and Ernest born Sept. 27, 1916. Fredrick Peterson is a professor. He graduated from Montana State Teachers College and also attended the college at McPherson, Kansas. He is a well-known educator though out Montana.