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On the 20th anniversary of her death, Diana's sons have stepped into the spotlight to talk about their battles with mental health issues and their favourite memories of their beloved Mum.

When the documentary Diana, Our Mother: Her Life and Legacy debuted on HBO on Monday, July 24, 2017, the world sat up and took notice. It afforded viewers unprecedented access to Kensington Palace, complete with a treasure trove of previously unpublished family photos and unfiltered conversation with Diana Spencer's sons, Princes William and Harry.

For all the tabloid rumours and conspiracy theories surrounding her death, Diana's boys were finally able to show the world—on the 20th anniversary of her death—how they wanted their mother to be remembered.

William, the Duke of Cambridge, was only 15 years old when his mother was suddenly taken from him on August 31, 1997. Prince Harry was a mere 12 years old. "Losing someone so close to you is utterly devastating, especially at that age," William, now 35, says in Diana, Our Mother. "There's not many days that go by that I don't think of her."

While promoting their mental health initiative Heads Together earlier this year, both William and Harry admitted they wished they'd spoken more openly about the pain of losing their mother.

"We've never really talked about losing a mum at such a young age," Harry, 32, revealed. "I always thought to myself, 'What's the point of bringing up the past, what's the point of bringing up something that's only going to make you sad? It ain't going to change it, it ain't going to bring it back.' And when you start thinking like that, it can be really damaging."

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Now the royal siblings are doing everything in their collective power to publicly commemorate the memory of their late mother, including commissioning a statue that will stand on the grounds of Kensington Gardens, which they will be able to see from their apartments in the palace.

The world was left devastated by the sudden loss of Diana, the People's Princess. The intensity of grief that followed the news of her death took everyone by surprise. Diana never got to watch her sons grow up, travel the world, get married or have kids, but there's no doubt she'd be proud of their wealth of accomplishments.

Here, we look back at some of our favourite photos of Diana with her boys.

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