Duchess Catherine made a heartwarming promise to the family of a young boy who was cared for by her patronage East Anglia Children's Hospices.

The clip was posted to social media where the Duchess of Cambridge alongside Duchess Camilla spoke to those involved with the hospice via video chat.

Duchess Kate shared a special moment with one family in particular and made a pledge of her own for their late son.

In the video, Duchess Kate is speaking to Stuart and Carla Delf with their 13-year-old son Stuie.

Stuie ran a sponsored 5K every day last month in memory of his brother Fraser who passed away in January at the young age of 9.

To mark the start of #ChildrensHospiceWeek, The Duchess of Cornwall and The Duchess of Cambridge joined a video call with three children’s hospices.

Join us in thanking all those involved in children’s hospices 👏

Watch the full video ➡️ https://t.co/WV5KCd5XvZ @KensingtonRoyal pic.twitter.com/kyUmXA1nY1

— Clarence House (@ClarenceHouse) June 22, 2020

Speaking about the Hospice that looked after Fraser, Kate said: "Children's hospices go that extra mile actually and support families like yourselves, I think it's extraordinary."

Fraser's mother, Carla said: "The care was amazing, not just towards Fraser, making sure he was comfortable, but our wellbeing was met."

Stuart, Fraser's father, later revealed that Duchess Kate had pledged to plant a sunflower in memory of Fraser, confirming it would be planted at "one of the hospices".