When Gustav Adam was born on 27 September 1902, in McLean, North Dakota, United States, his father, Friedrich Adam, was 22 and his mother, Amalia Kundt, was 21. He married Mabel Lena Kortmeyer on 19 January 1930, in Boyd, Nebraska, United States. They were the parents of at least 1 son and 1 daughter. He lived in Kootenay 1, East Kootenay, British Columbia, Canada in 1911 and Basin Township, Boyd, Nebraska, United States in 1930. He died on 16 December 1963, in South Dakota, United States, at the age of 61, and was buried in Lake Andes, Charles Mix, South Dakota, United States.