Frederick Kemper was born on 20 June 1748, in Fauquier, Virginia, United States, his father, John Peter Kemper, was 30 and his mother, Anna Elizabeth Fischbach, was 25. He married Mary “Molly” Jeffries on 24 October 1774, in Fauquier, Virginia, United States. They were the parents of at least 1 son and 4 daughters. He died on 20 November 1783, in Virginia, United States, at the age of 35.
https://www.familysearch.org/en/tree/person/about/LZJJ-V38