When Alexander F Jr Hamilton was born on 1 December 1891, his father, Alexander F Hamilton, was 35 and his mother, Louisa Hrobsky, was 24. He married Orpha Leone Coon on 22 August 1918, in Janesville, Rock, Wisconsin, United States. They were the parents of at least 1 son and 3 daughters. He lived in Janesville, Rock, Wisconsin, United States for about 40 years and Wisconsin, United States in 1974. He died on 9 January 1974, at the age of 82.