The British Royal Family.

The monarch of the UK is Queen Elizabeth  II and she belongs to the Windsor dynasty.
Queen Elizabeth II is the head of the State and of the Church of England. She also governs the military force and she can declare war and mark the peace.
Originally, Elizabeth's family name was different, it was Saxe-Coburg and Gotha. Elizabeth's grandfather, King George V, changed the name because having a German surname was very unpopular, because of the war.
When King George V died, his son King Edward VIII took his place, but he abdicated because he wanted to marry an American divorced woman. So King George VI becomes the new king and when he died, his daughter Elizabeth II becames the queen. 

She married Philip, Duke of Edinburgh, and they had four children: Prince Charles, Prince of Wales, Princess Anne, Prince Andrew, Duke of York and Prince Edward, Earl of Wessex.
Prince Charles married Lady Diana Spencer, Princess of Wales and they have two children: Prince William and Prince Harry.
Prince William married Kate Middleton in 2011 and after two years they have a child, George Alexander Louis.