A corporation that is entirely owned by the members of a single family WordNet 3.0 & Open English WordNet

A family business is a commercial organization in which decision-making is influenced by multiple generations of a family, related by blood or marriage or adoption, who has both the ability to influence the vision of the business and the willingness to use this ability to pursue distinctive goals. Wikipedia

Company owned and operated by members of one or more families. Wikipedia Disambiguation

A business whose owners are all members of the same family. Wiktionary

Business whose owners are all members of the same falimy. Wiktionary (translation)