There’s no denying that Princess Diana's main priority was always her family. But although we know a great deal about Prince Charles, Prince William and Prince Harry, we know little in comparison about the rest of her family members, including her brother.

Yup, in addition to her two older sisters, the Princess of Wales also has a younger brother—Charles Spencer. The now not-so-little bro is now 57 years old and has built quite the life for himself as he continues to honor his sister’s memory. Keep reading for everything we know about Princess Diana's brother.

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1. Who is Charles Spencer?

Born Charles Edward Maurice Spencer on May 20, 1964, Charles is Princess Diana's only brother, making him Prince William and Harry's maternal uncle.

He’s the youngest among his siblings. As we mentioned above, aside from Diana, he has two older sisters Lady Sarah McCorquodale and Lady Jane Fellowes. In addition to once being Prince Charles’s brother-in-law, the youngest Spencer also has some other royal ties. In fact, Queen Elizabeth is his godmother. Who knew?

2. Does he have a royal title?

Yup, Charles is formally the 9th Earl of Spencer, a title he inherited when his father passed away in 1992. His other titles include 9th Viscount Althorp, 9th Viscount Spencer of Althorp, 9th Baron Spencer of Althorp and 4th Viscount Althorp.

3. What does he do for a living?

In addition to his royal duties, Charles has quite the resume. He started his career as a journalist and television reporter with NBC News where he worked between 1986 and 1995 for Today and NBC Nightly News.

He's also an accomplished author and has published a number of titles that analyze British history, including Sunday Times bestsellers Blenheim: Battle for Europe and Prince Rupert: The Last Cavalier. (One of his books even recently became a #1 bestseller on Amazon.) Charles is also quite the philanthropist and is involved in several charitable organizations such has Whole Child International.

4. Does he have a wife and kids?

Yup, he married Karen Villeneuve back in 2011 and has been happily married ever since. However, this isn’t his first marriage. He divorced his first wife, Victoria Aitken in 1997 and his second wife Caroline Freud in 2007.

And with those three marriages came seven children. In fact, his daughter, Lady Kitty Spencer, recently had a wedding of her own. The British fashion model got married last week during a gorgeous ceremony in Italy. According to Daily Mail, Spencer and her now husband, Michael Lewis, got married at the Villa Aldobrandini country mansion in Frascati. (Yes, her siblings and father were in attendance).

5. Anything else we should know?

Charles has quite the social media presence. If you’re ever looking for Princess Diana throwbacks or photos of their family’s childhood home, the Earl of Spencer’s personal Instagram account is the place to visit.

Earlier this month, the earl shared a photo of three of his family members, with a caption that said, “My grandfather, great aunt and great uncle - Jack, Lavinia and Cecil Spencer - setting off for a fancy dress party in 1902.”

The 9th Earl Spencer revealed a special connection to the royal family, saying, “Lavinia married a local aristocrat, and served the late Queen Mother as a Lady In Waiting, when the Queen Mother was Duchess of York: she and Lavinia were childhood friends.”

We’ll be keeping up with Charles more often.

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RELATED: THIS RARE CHILDHOOD PHOTO OF PRINCESS DIANA WILL MAKE YOU DO A DOUBLE TAKE

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