That is one of the possible definitions of an aristocracy.
A family or group that maintains power for several generations is called a 'Dynasty'
Dynasty
-a family -a race -a series of generations -a group
The pronoun it would be used to take the place of the noun family when used as a unit.The pronouns they, as a subject, and them, as an object would be used in place of the noun family as the group of people or creatures.EXAMPLESTheir family has lived here for several generations. It has been influential in the growth of local business.A family of lions was spotted in the distance. They appeared very watchful so we did not approach them.
Phosphate group
Malcolm's group from the novel "The Glory Field" is called the Lacey family. They are descendants of Muhammad Bilal, who was captured and brought to America as a slave. The story follows the family through multiple generations, highlighting their struggles and triumphs.
The Fugger family of Augsburg was a prominent group of European bankers during the 15th and 16th century. Over several generations, they came to control much of the European economy and had enormous wealth. They replaced the de Mecdicis during the Renaissance. They had mining interests, and traded wool, silk and spices throughout much of Europe.
A larger social group than a family, containing several unrelated groups of people.
A Lakota family typically consisted of an extended family group, with multiple generations living together in a tipi. A large tipi could accommodate around 10-15 family members comfortably.
married couples
Erethizontidae is an animal group--more specifically, a rodent family. The family consists of several species of porcupines. You can find more information about this group here: http://animaldiversity.ummz.umich.edu/site/accounts/information/Erethizontidae.html
The platypus's family group is Ornithorhynchidae.