The book, A Family had a Business, aims to focus on the structure of the family and what the family means as a system and has been prepared accordingly to it. Family businesses are of critical importance for all national economies because these are significant enough to directly affect the economy. Certain determinations have been made about the sociological dynamics of today's family structure and the social functions undertaken by the family in the light of current problems. Conducting a comparative family business study includes a necessary analysis to search for the international equivalent of this concept. A research that can find answerts to topics such as How to write a family constitution? Is sustainability possiple in businesses? Social Capital in Family Businesses has been prepared.