How Prince William and Prince Harry remember their mother Princess Diana every year on the anniversary of her death

Remembering their mother.

Today, August 31,2019, marks the 22nd anniversary of Princess Diana's death, and her sons, Prince William and Prince Harry, will likely honor her life and legacy together in a private setting.

Every year on the anniversary of her tragic death, Diana's sons reportedly get together for lunch or dinner at Kensington Palace, where they both lived until Harry moved out this spring, and remember all of the good times that they shared with their mother.

"They talk about the little things about Diana that made them laugh: the ski trips and outings to Thorpe Park [a British amusement park]; the effort she went to on their birthdays -- all of it," a source told Us Weekly of William and Harry, adding that "their other halves [Kate and Meghan] and kids join them later."

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In addition to simply sharing their fondest memories with Diana, who was killed in a tragic car accident in 1997, when William was 15 and Harry was 12, the Duke of Cambridge and Duke of Sussex also try to come up with new ways that they can carry on the selfless humanitarian work that she dedicated her life to.

"They always discuss Diana’s charity work and brainstorm ways they can continue her legacy," the source added. "Helping others and being a role model to those less fortunate is at the top of their priority list."

In the years since their mother's death, both William and Harry have been fairly candid about the effect that her passing had on them and the various emotions that they've experienced in the two decades without her in their lives.

"I think when you are bereaved at a very young age, anytime really, but particularly at a young age -- I can resonate closely to that -- you feel pain like no other pain," William, 37, said in a mental health documentary released this spring. "And you know that in your life it’s going to be very difficult to come across something that is going to be an even worse pain than that."

Harry has similarly found comfort in those who have also lost people close to them, as a veteran recently recalled the duke telling him at the 2020 Invictus Games launch in May, days after Harry welcomed his first son, Archie, into the world.

"I told Harry about my mother and we talked about our shared experience of missing a mum. He said missing a mother is like missing some kind of security, how you need that as a son and it falls away when you lose your mother," the vet recalled of his conversation with Harry. "He said he meets a lot of people in his work who have lost a mother, father, sister, brother or relatives and when he hears their story, as he heard my story, he said he doesn’t feel so alone."

SEE ALSO: Look back at Prince William and Prince Harry's best moments with Princess Diana

Earlier this month, Harry and his wife, Meghan Markle, paid tribute to Diana on their Instagram account for the first time, sharing an inspiring quote uttered by his late mother that read, "Carry out a random act of kindness, with no expectation of reward, safe in the knowledge that one day someone might do the same for you."

"Words have the power to inspire, which is why we’re happy to share some of our favourite quotes," Harry and Meghan captioned the post. "From members of the public to public figures, from teachers and students to young leaders, we begin with a quote from Diana, Princess of Wales."

While the couple, along with Prince William and wife Kate Middleton, strive to carry on Diana's teachings and good example, they have also maintained a close bond to the rest of her family, including her siblings.

Diana's sisters Lady Sarah McCorquodale and Lady Jane Fellows were both at the baptism of Harry and Meghan's son, Archie Harrison, at the beginning of July, and they appear in the official christening photos released by the palace following the private ceremony.