When Frederick William Simpson was born on 1 October 1890, in Denver, Colorado, United States, his father, William C. Simpson, was 41 and his mother, Catherine W. Bradley, was 35. He married Selena Rae Jeffs on 20 October 1913. They were the parents of at least 2 sons. He lived in Denver, Arapahoe, Colorado, United States in 1900 and Judicial Township 6, Mariposa, California, United States in 1930. In 1910, at the age of 19, his occupation is listed as clerk, grocery store in Denver, Colorado, United States. He died on 29 May 1949, in Los Angeles, Los Angeles, California, United States, at the age of 58, and was buried in Culver City, Los Angeles, California, United States.