When Jan Willem Addink was born on 20 May 1886, in Sioux Center, Sioux, Iowa, United States, his father, Hendrik Willem Addink Sr, was 51 and his mother, Garritjen Ketelarij, was 40. He married Jennie Lammers on 3 February 1910, in Sioux Center, Sioux, Iowa, United States. They were the parents of at least 2 sons and 5 daughters. He lived in Alton, Sioux, Iowa, United States in 1925 and Center Township, Sioux, Iowa, United States for about 10 years. He died on 10 November 1966, in Sioux Center, Sioux, Iowa, United States, at the age of 80.