Kate Middleton's parents make a surprise appearance in new video

Kate Middleton's parents Carole and Michael Middleton made a cameo appearance in the video in which the Princess of Wales announced that she had completed her chemotherapy.

On September 9, the 42-year-old Princess of Wales announced updates on her health in a new, intimate video, which features the Queen with her husband Prince William and their children Prince George (11), Princess Charlotte (9) and Prince Louis (6), and also features her parents.

In a heartwarming moment in the three-minute clip, Carole, 69, and Michael, 75, join Kate, William and their grandchildren for a cosy game of cards. Prince Louis, sitting on his father's lap, joins in the fun as Carole and Louis eagerly prepare to play their cards.

The catchy family play scene was filmed last month in Norfolk, where Kate and William have a country home. The clip was one of many in Princess Kate's most personal family video ever.

Princess Kate's parents were there for their daughter when she announced in March that she was undergoing cancer treatment. Carole has accompanied Kate to pick up her children from school, and the princess's younger siblings, Pippa and James, also live nearby with their families.

“It's about supporting her and making her feel supported. It's a collaborative effort. She doesn't feel isolated at all,” a longtime family friend told PEOPLE exclusively at the time.

Commenting on the strong family dynamic the Prince and Princess of Wales have built, they added: “The nuclear family they have built so well is a tremendous support not only for him but for Catherine too.”

A source previously told PEOPLE that Kate's parents would be “there to support her” after her abdominal surgery in January. The Middletons are a constant presence in their grandchildren's lives, often inviting George, Charlotte and Louis for overnight visits.

“Their parents are a lasting factor in the upbringing of their grandchildren,” said a palace insider.

Carole and William also reportedly went to a local pub together in April, and the Princess of Wales' parents accompanied Prince William at Royal Ascot in June. Princess Kate has been out of the spotlight for almost all of 2024, as she scaled back her royal duties to prioritize her health and mentioned her loved ones in her latest video message.

“The last nine months have been incredibly tough for us as a family. Life as you know it can change in an instant and we have had to find a way to navigate the stormy waters and the unknown path,” the Princess of Wales said, among other things.

“The course of cancer is complex, frightening and unpredictable for everyone, especially those closest to you,” she continued.

“With humility, you also confront your own vulnerabilities in ways you've never considered before, and it gives you a new perspective on everything. Most of all, this time has reminded William and me to reflect on and be grateful for the simple but important things in life that so many of us often take for granted. To simply love and be loved.”

Princess Kate said she is now focused on “doing everything I can to stay cancer free.”

“Although I have completed chemotherapy, my road to healing and full recovery is long and I must continue to take each day as it comes,” she said, hinting at what lies ahead.

“However, I am looking forward to getting back to work and making some more public appearances in the coming months if possible. Despite everything that has happened before, I am starting this new phase of recovery with a renewed sense of hope and a greater appreciation for life,” Kate said.

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The video was the second the Princess of Wales has released this year to share news about her health. On January 17, Kensington Palace announced that Kate had “scheduled abdominal surgery” the day before, and on March 22, she released a self-written video message announcing that she was undergoing cancer treatment.

The royal mother asked for “time, space and privacy” with her family while she completed her treatment. In a June 14 update on her health, she thanked well-wishers for their understanding and confirmed that she will attend Trooping the Colour – her first official royal event of the year – in 2024.