英文BOOK REPORT..急...

A royal family is the extended family of a monarch. Generally, the head of a royal family is a king or queen regnant. The term "imperial family" more appropriately describes the extended family of an emperor or empress regnant, while the terms "ducal family", "grand ducal family" or "princely family" are more appropriate in reference to the relatives of a reigning duke, grand duke, or prince. It is also considered proper in some circles to refer to the extended relations of a deposed monarch and his or her descendants as a royal family.
A royal family typically includes the spouse of the reigning monarch, surviving spouses of a deceased monarch, the children, grandchildren, brothers, sisters, and cousins of the reigning monarch, as well as their spouses. In some cases, royal family membership may extend to great grandchildren and more distant descendants of a monarch. In certain monarchies where voluntary abdication is the norm, such as the Netherlands, a royal family may also include one or more former monarchs. There is often a distinction between persons of the blood royal and those that marry into the royal family. In certain instances, such as in Canada, the royal family is defined by who holds the titles Majesty and Royal Highness.[1] Under most systems, only persons in the first category are dynasts, that is, potential successors to the throne (unless the member of the latter category is also in line to the throne in their own right, a frequent occurrence in royal families which frequently intermarry). This is not always observed; some monarchies have operated by the principle of jure uxoris.