>There are some cultures where family businesses, where most members of the family work and participate, are the norm. Quite a huge population of people operate that way.
Yes. Among Indian comunities, Gujaratis (particularly the Patel sub-community who own the majority of US motels, the Ambanis - Reliance group, big) and the Marwaris (some big Indian businessmen among them, like the Birlas, Ruias, Goenkas), are examples of this.
Possibly Kashmiris (handicrafts shops), Punjabis and Sikhs (auto parts shops, dhabas, etc.), Bunts (a Karnataka sub-community, Udupi restaurants), and Chettiars (gold and jewelry shops, money-lending, trading abroad) too.
And I am only writing about those I know about. There could be others too.