• Prince William and Prince Harry launch a new documentary
• The royal siblings share their childhood memories on their mother's 20th death anniversary
• They regret the short duration of their last phone call with their mother

Washington D.C. [USA], July 26: Prince William, as well as his brother, Prince Harry in the past, have talked about how they regret talking for only a short duration when their mother Princess Diana called them just a few hours before her death.

Princess Diana died in 1997 in Paris due to a car crash. The two royal brothers were present at Balmoral Castle in Scotland when their mother called from Paris.

They are launching a new documentary in the wake of their mother's 20th death anniversary which is about to fall next month. In this HBO and ITV documentary, 'Diana, our Mother: Her Life and Legacy', the royal siblings have shared their childhood with the people and it celebrates the work and life of the Princess of Wales, mentioned PTI report.

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"I can't necessarily remember what I said, but all I do remember is regretting for the rest of my life how short the phone call was," Harry told ITV. He shared that had he known it was the last time he was speaking to his mother, he would have done things differently. "Looking back at it now — it's incredibly hard. I have to deal with that for the rest of my life: not knowing that it was the last time I'd speak to my mum, how differently that conversation would have panned out if I'd had even the slightest inkling that her life was going to be taken that night."

Prince William, in this documentary, said that both of them were running around, playing with their cousins, having a great time and were in a hurry to say goodbye and cut the phone. "If I'd known what was going to happen I wouldn't have been quite so blase about it," the Duke of Cambridge said. "That phone call sticks in my mind quite heavily."

The brothers, aged 35 and 32, have opened their family album for the nation to see and given it the most in-depth insight into their mother's life at Kensington Palace. Prince Harry recalls few of the most cheerful childhood moments. He also mentioned that Diana, their mother was a "kid through and through."

Prince William, in his statement, said that both the brothers felt incredibly loved and they are grateful that they can still feel it.

-prepared by Harsimran Kaur of NewsGram. Twitter @Hkaur1025