Happy 101st birthday to Prince William and Prince Harry’s British House of Windsor

The royal family tree of Britain's monarchy is quite a thing to behold.

 King George V, the first monarch from Britain's House of Windsor, and his wife Mary of Teck had six children. Four of those offspring proceeded to have children of their own.

 As a result, well-known royals, such as the children of Prince William and Kate Middleton – the Duke and Duchess of Cambridge – four-year-old Prince George of Cambridge and his younger siblings, Princess Charlotte and Prince Louis, have many less-famous cousins.

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The House of Windsor, which celebrated the wedding of Prince Harry to former American actress Meghan Markle – now officially known as the Duke and Duchess of Sussex – at Windsor Castle in May, is a relatively young dynasty: it turns 101 years old today.

King George V, a grandson of Queen Victoria, inherited the throne in 1910.

Like his father King Edward VII, he was a member of the House of Saxe-Coburg and Gotha. The German dynasty was injected into the British monarchy by Albert, Prince Consort, the husband of Queen Victoria.

Yet by 1917, English attitudes towards Germany had soured considerably, thanks to the 1914-18 first world war.

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In response to rising anti-German sentiments, George V decided to make a considerable public relations move.

He changed Saxe-Coburg and Gotha for the far more English-sounding name of Windsor.

The royal family's website said the new name was inspired by Windsor Castle – where George V’s granddaughter, Queen Elizabeth still lives at weekends.

Here's an in-depth look at the British royal family tree, beginning with the family that started it all:

King George V was the first monarch of the House of Windsor

King George V and his wife Mary of Teck had six children together between 1894 and 1905.

One of their children did not survive into adulthood.

Prince John, the baby of the family, had severe epilepsy and a learning disability. He died in 1919 at the age of 13.

Their eldest son, King Edward VIII, inherited the throne upon his father's death in 1936.

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Had he remained king, Edward VIII's hypothetical descendants would have inherited the British Crown.

But Edward VIII abdicated in 1937 to marry American divorcee Wallis Simpson.

The controversial couple – who were rumoured to harbour Nazi sympathies – never had children.

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King George VI's descendants dominate the current line of succession

After his older brother's abdication, King George VI ascended the throne for a reign lasting nearly 15 years.

He and his wife Queen Elizabeth had two daughters, Princess Elizabeth, who went on to become Queen, and Princess Margaret.  

George VI’s descendants are set to continue to inherit the throne in the foreseeable future.

His eldest daughter Queen Elizabeth, is the longest reigning British monarch in history.

Her son Charles, Prince of Wales, is reportedly set to succeed her when she turns 95 in 2021.

The Lascelles family is descended from King George V's only daughter

Mary, Princess Royal, was George V’s only daughter.

She had two sons with her husband, Henry Lascelles, 6th Earl of Harewood.

The princess’ sons went on to produce six grandchildren, 17 great grandchildren, and nine great great grandchildren.

The Earldom of Harewood is still held within the Lascelles family.

The eldest two children of David Lascelles, the current 8th Earl of Harewood, were born before Lascelles married his first wife. They were therefore unable to inherit his title.

Leo Cyrus Anthony Lascelles, the only son of Alexander Lascelles, Viscount Lascelles, is also not eligible to inherit his family’s royal title, as his parents were not married at the time of his birth.

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The dukedom of Gloucester is still held by the descendants of Prince Henry

Prince Henry, Duke of Gloucester, and his wife, Lady Alice Montagu Douglas Scott, had two sons together. One, the Prince William of Gloucester, died in a 1972 plane crash.

He had not had any children, so the title passed onto his younger brother Richard.  

Prince Richard, Duke of Gloucester, inherited his father’s dukedom and went on to have three children and six grandchildren.  

Prince George's great grandson will eventually become the Duke of Kent – but never inherit throne

Prince George, Duke of Kent, and his wife, Princess Marina of Greece and Denmark, had three children before he was killed in a 1942 military aeroplane crash.

His descendants include seven grandchildren and 16 great grandchildren.

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Edward Windsor, Lord Downpatrick, and Lady Marina Charlotte Windsor are both confirmed Roman Catholics, meaning they are banned from succession to the Crown.

However, Downpatrick is still in line to inherit the Dukedom of Kent.

He will potentially become the first Catholic Duke of Kent in centuries.

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This article originally appeared on Business Insider.