When Milton Herbert Thatcher was born on 19 November 1865, in Logan, Cache, Utah Territory, United States, his father, John Bethewel Thatcher Sr, was 31 and his mother, Rachel Hannah Davis, was 28. He married Hattie Vilate Hale on 11 June 1890, in Logan, Cache, Utah Territory, United States. They were the parents of at least 4 sons and 4 daughters. He lived in Preston, Oneida, Idaho, United States in 1900. He died on 30 August 1908, in Lava Hot Springs, Bannock, Idaho, United States, at the age of 42, and was buried in Preston Cemetery, Preston, Franklin, Idaho, United States.