Charles Oudin the elder and his brother Nicolas each had a son who became a watchmaker, and both were employed in the Paris workshop of Abraham-Louis Breguet (1747-1823), considered the creator of modern horology.
When Breguet fled France during the French Revolution, taking refuge in Switzerland, Charles Oudin (known as "Oudin Sedan" in the Breguet account books) helped his assistant, Boulanger, continue to run the workshop.