From 1900 to 1940, family businesses in the brick- and tile-making industry of Athens and its port, Piraeus, were a notable institution that played an important role in the development of the sector and its transformation from artisanal to factory production. They formed a dense network of small and medium-scale units, from which more than 20 big factories would emerge after the 1920s. Α strong and constant antagonism between them, on the one side, and the few European-scale large industrial units, on the other, developed. Within this framework, the story of the Athens brick industry in this period can be vividly interpreted through the function and evolution of familial firms (which were under the control of nuclear, extended or multinuclear families) and the actions of their owners.