When Bertholdt Martin August Frenz was born on 30 June 1871, in Germany, his father, Martin Frenz, was 39 and his mother, Wilhelmine Doering, was 38. He married Ida Priebe on 8 September 1897, in Carver, Minnesota, United States. They were the parents of at least 1 son and 1 daughter. He lived in Carver, Carver, Minnesota, United States in 1920 and Chaska Township, Carver, Minnesota, United States in 1940. He died on 1 September 1955, in Minneapolis, Hennepin, Minnesota, United States, at the age of 84, and was buried in Mount Hope Cemetery, Carver, Carver, Minnesota, United States.