I'm just getting into this, so this may be old information. Hamburg was a small community on the bluffs of the Missouri River in St. Charles county between St. Charles and Defiance, MO. There is a cemetery there with a current cemetery board. You might find out a lot of information by contacting them.
My husband's mother was the daughter of Albert G. Ruebeling and Adelia Engelage Ruebeling. She was born in Defiance in 1914. Albert G. died in 1966 at my mother-in-law's home. My husband remembers that Albert G. had a brother who died at a very young age. Could that be Adam?