Born in Illinois, Dapprich and his wife resided in New York, NY, where he worked as a waiter. They lived in Richmond, VA, in 1918, Fred working as a self-employed advertising agent; he and his wife lived (and worked) at 1200 Lamb Avenue in 1918. Dapprich died in Port Huemene, Ventura County, CA, at the age of 84.

His mother's maiden name was Hilgarten; she was from MD. His father was Ferdinand (Frederick) Dapprich, an immigrant from Germany; he served in the Civil War as a musician in the 24th Regiment, Illinois Infantry.

Fred Dapprich married Margaret E. Dapprich before 1918. She was born in Chicago, IL, c. 1885; her father was born in NY, her mother was of English-Irish descent.

SSN: 545-46-6534. His World War I Draft Card dated 09/12/1918 described Dapprich as tall and slender with brown hair and brown eyes.