Prince William and Prince Harry rededicate Princess Diana's grave on what would have been her 56th birthday



Prince William and Prince Harry are honoring their mother, Princess Diana, on what would have been her 56th birthday.

The Duke of Cambridge and his brother gathered with family on Saturday to pay tribute to their beloved mother, who died in a car crash in Paris, France, on Aug. 31, 1997.

WATCH: Prince William, Prince Harry and Kate Middleton to Rededicate Princess Diana's Grave on Her Birthday

The royals rededicated her grave and held a private memorial service on the island of the Oval Lake at Althorp House in England, the Princess of Wales' family estate in Northamptonshire where she grew up and was laid to rest nearly 20 years ago.

According to BBC News, Prince William's wife, Kate Middleton, was by his side during the emotional tribute, along with their two children, Prince George, 3, and Princess Charlotte, 2, and Diana's brother, Charles Spencer, 9th Earl Spencer. The service was led by Justin Welby, the Archbishop of Canterbury.

Prince Charles -- Diana's ex-husband and Harry and William's father -- was notably absent from the service, as he was performing Royal duties in Ottawa with his wife, Camilla, Duchess of Cornwall, in honor of Canada's 150th birthday, The Telegraph reports.

PHOTOS: Prince William, Prince Harry and Kate Middleton together

23 PHOTOS
Prince William, Duchess Kate and Prince Harry together
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Prince William, Duchess Kate and Prince Harry together
Britain's Kate, Duchess of Cambridge, and Prince Harry applaud Prince William after his speech during a training event to promote the charity Heads Together, at the Queen Elizabeth II Park in London, Britain, February 5, 2017. REUTERS/Alastair Grant/Pool
Britain's Prince William, Kate Duchess of Cambridge and Prince Harry (L) stand ready to give an award during a visit to The Mix in London, December 19, 2016. REUTERS/Alastair Grant/Pool
HAYES, UNITED KINGDOM - APRIL 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the official opening of The Global Academy in support of Heads Together on April 20, 2017 in Hayes, England. The Global Academy is a state school founded and operated by Global, The Media & Entertainment Group, educating students for careers in broadcasting and the digital media industry. (Photo by Max Mumby/Indigo/Getty Images)
Kate Duchess of Cambridge, Prince William, and Prince Harry (R) greet guests attending the Patron's Lunch, an event to mark Britain's Queen Elizabeth's 90th birthday, in London, June 12, 2016. REUTERS/Peter Nicholls
LONDON, ENGLAND - APRIL 05: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the Service of Hope at Westminster Abbey on April 5,2017 in London, United Kingdom. The multi-faith Service of Hope was held for the four people killed when Khalid Masood committed an act of terror in Westminster on Wednesday March 22. Survivors, bereaved families and members of the emergency services joined The Duke and Duchess of Cambridge, Prince Harry, the Home Secretary, Amber Rudd and London Mayor, Sadiq Khan, in the congregation. (Photo by Dan Kitwood/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 05: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge join a Team Heads Together London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
The Duke and Duchess of Cambridge and Prince Harry leaving the Institute of Contemporary Art in London where they outlined the next phase of their mental health Heads Together campaign.
Catherine Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry visit the Visitors Centre during the Somme centenary commemorations at the Thiepval memorial in France on July 01, 2016
The Duke and Duchess of Cambridge and Prince Harry at the Patron's Lunch in The Mall, central London in honour of the Queen's 90th birthday, in an open topped Range Rover.
Prince Harry, the Duke and Duchess of Cambridge leave St Paul's Cathedral in London following a national service of thanksgiving to celebrate the 90th birthday of Queen Elizabeth II.
Prince William, Duke of Cambridge, Prince Harry and Catherine, Duchess of Cambridge, wearing a skirt by Banana Republic and a blouse by GOAT Fashion, arrive to attend the launch of the Heads Together campaign at Olympic Park in London on May 16, 2016
The Duke of Cambridge (left), The Duchess of Cambridge (centre) and Prince Harry (right) attend the World Premiere of Spectre, held at the Royal Albert Hall in London.
The Duke and Duchess of Cambridge and Prince Harry arriving for the annual Commonwealth Day service at Westminster Abbey, London, on Commonwealth Day.
Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry visit The Tower Of London's Ceramic Poppy installation 'Blood Swept Lands and Seas of Red' by artist Paul Cummins, commemorating the 100th anniversary of the outbreak of First World War.
The Duke and Duchess of Cambridge and Prince Harry watch riders at the finish line of Stage 1 of the Tour de France in Harrogate.
Prince Harry, the Duchess of Cambridge and the Duke of Cambridge watch a fly-past by the RAF on the balcony at Buckingham Palace following the Trooping the Colour parade, London.
Prince Harry, the Duchess and Duke of Cambridge with their wands on the set used to depict Diagon Alley in the Harry Potter Films during their visit to Warner Bros studios in Leavesden, Herts where the popular movies were produced.
The Duke and Duchess of Cambridge watch with Prince Harry during the Team Eventing Jumping Final on day four of the London Olympic Games at Greenwich Park, London.
The Duke and Duchess of Cambridge and Prince Harry chat with children during a visit to Bacon's College in Greenwich, London, where they attended the launch of a new sports project that aims to train the next generation of sports coaches.
Prince William (left), Catherine, Duchess of Cambridge and Prince Harry stand on the balcony at Buckingham Palace during the Diamond Jubilee celebrations in central London.
The Duke and Duchess of Cambridge talks to Prince Harry before a reception in the Waterloo Chamber, before her Sovereign Monarchs Jubilee lunch at Windsor Castle.
Prince William and his bride Kate leave Westminster Abbey, London, after their wedding, followed by Prince Harry (rear, left) and Pippa Middleton (rear, right).
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RELATED: Prince Harry Recalls Having to Walk Behind Princess Diana's Coffin

At the time of Diana's death, William was 15 and Harry was 12. The two are hoping to now "stand up for her name" and do their duties "as sons" in protecting her and reminding everyone "of the character and person that she was," according to a new BBC documentary with the working title Diana.

"Part of the reason why Harry and I want to do this is because we feel we owe it to her," William explains in the film. "I think an element of it is feeling like we let her down when we were younger. We couldn't protect her."

"I think it's never going to be easy for the two of us to talk about our mother, but 20 years on seems like a good time to remind people of the difference that she made, not just to the royal family, but also to the world," adds Harry.

Hear more on how they're honoring her legacy in the video above.

WATCH: Prince William Says He Wishes Princess Diana Could Have 'Seen the Children Grow Up'

PHOTOS: Princess Diana with her sons

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Princess Diana with her sons
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Princess Diana with her sons
VENICE, ITALY - MAY 5: (FILE PHOTO) (L-R) Diana the Princess of Wales holds her son Harry, whilst looking at Prince William held by his father Prince Charles on May 5, 1985 in Venice, Italy. Prince William will celebrate his 21st birthday on June 21, 2003. (Photo by Georges de Keerle/Getty Images)
Princes William and Harry with their mother, Diana, Princess of Wales (1961 - 1997) in the garden of Highgrove House in Gloucestershire, 18th July 1986. William is wearing a Dallas Cowboys t-shirt.(Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana At Highgrove With Prince William And Prince Harry Dressed In Miniature Parachute Regiment Uniforms And Playing On Their Slide In The Garden (Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana With Her Sons Prince William And Prince Harry Playing With A Playhouse In The Garden Of Their Home Highgrove (Photo by Tim Graham/Getty Images)
The Prince and Princess of Wales on holiday with their children, Princes William and Harry, at the Spanish royal residence Marivent Palace, August 1987. (Photo by Terry Fincher/Getty Images)
The Princess of Wales arriving at Aberdeen airport with her sons William and Harry for a holiday at Balmoral Castle, August 1986. Princess Diana is wearing a polo motive sweater by Mondi. (Photo by Jayne Fincher/Getty Images)
UNITED KINGDOM - DECEMBER 01: Prince Charles, Prince of Wales and Diana, Princess of Wales at home in Kensington Palace with their sons Prince William and Prince Harry (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 16: Princess Diana And Prince William Leaving After Delivering Prince Harry To Mrs. Mynor's Nursery School. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JUNE 11: Diana, Princess Of Wales, Holding A Young Prince Harry In Her Arms As She Watches Trooping The Colour With Prince William And Princess Margaret From The Balcony Of Buckingham Palace. (Photo by Tim Graham/Getty Images)
BALMORAL, SCOTLAND - AUGUST 18: Diana, Princess of Wales, and Prince Harry play on the banks of the River Dee, near Balmoral Castle.during a Summer vacation, on August 18, 1987, in Balmoral, Scotland. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, with Prince Harry ( centre ), and her Niece's and Nephew's on holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
BATH - MAY 30: (FILE PHOTO) Prince William, Diana, Princess of Wales, Prince Harry and Charles, Prince of Wales, attend the wedding of the Duke of Hussey's daughter in May, 1989 in Bath, England. (Photo by Anwar Hussein/Getty Images)
LONDON - SEPTEMBER 12: (FILE PHOTO) Princess Diana with her sons Prince William and Prince Harry at Wetherby School on September 12, 1989 in London, England. It is Prince Harry's first day at school. (Photo by Anwar Hussein/Getty Images)
Diana, The Princess Of Wales Takes Her Sons, Prince'S William, And Harry Out On The Boat ' Maid Of The Mist ' To View Niagara Falls. (Photo by Julian Parker/UK Press via Getty Images)
CHERTSEY, UNITED KINGDOM - APRIL 18: Diana, Princess of Wales, with Prince Harry, on the Depth Charge ride at Thorpe Park, Theme Park, on April 18, 1992 in Chertsey United Kingdom . (Photo by Julian Parker/UK Press via Getty Images)
LECH, AUSTRIA - APRIL 10: Princess Diana With Princes William & Harry Skiing In Lech, Austria (Photo by Tim Graham/Getty Images)
Diana Princess Of Wales, Prince William & Prince Harry Visit The 'Thorpe Park' Amusement Park. (Photo by Julian Parker/UK Press via Getty Images)
AUSTRIA - MARCH 30: Lech: Princess Diana, sons William and Harry going to restaurant in calash In Lech, Austria On March 30, 1993. (Photo by Laurent SOLA/Gamma-Rapho via Getty Images)
LECH, AUSTRIA - MARCH 27: Princess Diana With Prince William & Prince Harry In Sleigh During Ski Holiday In Lech, Austria. Behind Are Diana's Friends Kate Menzies And Catherine Soames (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - AUGUST 19: Princess Diana, Prince Harry [ Waving ] And Prince William Watching The Parade Of Veterans On V J Day, The Mall, London. Designer Of Diana's Suit - Tomasz Starzewski (please Check - People Magazine, 04/12/1999) (Photo by Tim Graham/Getty Images)
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess holding Prince William whilst pregnant with Prince Harry, and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess and Prince Harry on holiday and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
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