When Michael Sweeley Thatcher was born on 22 August 1905, in Liberty Township, Nuckolls, Nebraska, United States, his father, Franklin Ward Thatcher, was 31 and his mother, Susan Ann Sweeley, was 33. He married Freda Pearl Crawford on 22 December 1934, in Harrison, Sioux, Nebraska, United States. They were the parents of at least 3 sons. He lived in Converse, Wyoming, United States in 1930 and Election District 9 Glenrock, Converse, Wyoming, United States in 1940. He died on 11 October 1999, in St. Maries, Benewah, Idaho, United States, at the age of 94.