I doubt that you'll find any (or many) McFarlane relatives in Idaho, although quite a few migrated from Minnesota to Montana to homestead, some of whom remained in Montana. Some of the others returned to Minnesota.
Edmund McFarlane was born 6 August 1862 at Rosetta, Lanark County, Ontario. In 1881, he emigrated to Minnesota, where three of his bothers had settled. On 26 October 1885, he married Mary Etta Taylor. They had six children, Maude, Elsie Pearl, Joy, Dr. Lloyd Edmund, Etta 'Val', and Lyle K. Mary Etta Taylor died 11 August 1903. Edmund sold his harness shop in Parkers Prairie, MN,and retired in July 1920. In retirement, he moved to Blackfoot, Idaho. There, he married Nora Barker on 10 November 1921 at Idaho Falls. Edmund died 20 December 1935 at Blackfoot, and was buried at Parkers Prairie, MN on 27 December 1935. To the best of my knowledge, that ended the connection of this family to Idaho.