A royal family is the extended family of a king or queen regnant and 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. The specific composition of royal families varies from country to country
Deposed Royal families include the Brazilian Imperial Family, The Bulgarian Royal Family a line of the Kohary branch of the House of Saxe-Coburg and Gotha, The Greek Royal Family is a direct family member of the House of Schleswig-Holstein-Sonderburg-Glücksburg, and Portuguese Royal Family a collateral line of the House of Aviz and the Italian Royal family, the House of Savoy.
Famous Royal families include The British Royal Family, The Spanish Royal Family, The Grand Ducal Family of Luxembourg also know as the House of Nassau-Weilburg, The Ming Dynasty, The Dutch Royal family which is governed by members of the House of Orange-Nassau, The Danish Royal Family where the Queen’s children and male-line descendants belong agnatically to the family de Laborde de Monpezat and the House of Saud (Saudis).
The British Royal Family is the group of close relatives of the Monarch of the United Kingdom.
The term is also commonly applied to the same group of people as the relations of the monarch in his or her role as sovereign of any of the other Commonwealth realms, thus sometimes at variance with official national terms for the family.
Members of the royal family belong to, or are married into, the House of Windsor, since 1917, when George V changed the name of the royal house from Saxe-Coburg and Gotha. There is no strict legal or formal definition of who is or is not a member of the Royal Family.
The Grand Ducal Family of Luxembourg consists of the extended family of the sovereign Grand Duke. The medieval duchy of Luxembourg was elevated to a grand duchy in 1815 when William V, Prince of Orange ascended the grand ducal throne as its first holder.
The male-line descendants of Grand Duchess Charlotte hold the titles Prince(ss) of Luxembourg and Prince(ss) of Nassau with the style of His/Her Royal Highness (coming from their status as male-line descendants of Duke Robert of Parma). The title Prince of Bourbon-Parma was relinquished by Grand Duke Jean in 1986, but he and his relatives have kept the style of His/Her Royal Highness.