When Ralph Mills Sr was born on 12 November 1898, in Milton, Strafford, New Hampshire, United States, his father, Fred Wilbur Prescott Mills, was 22 and his mother, Anna L. Eaton, was 22. He had at least 3 sons and 3 daughters with Irene Isabella Weeks. He lived in Lanesborough, Berkshire, Massachusetts, United States in 1930 and Hudson, Columbia, New York, United States in 1940. He died on 8 February 1971, in Sanford, York, Maine, United States, at the age of 72.