Prince William recently made an uncommon public remark about his brother, Prince Harry, after years of strained relations between them.

In a newly released promo for the upcoming documentary Prince William: We Can End Homelessness, shared on YouTube on Saturday, October 26, the future king of England reminisced about a memory from their childhood together.

William, 42, recalled a time when their late mother, Princess Diana, took both him and Harry to The Passage – a UK-based charity that assists individuals experiencing or at risk of homelessness. This outing became a pivotal experience for him as a child.

“My mother took me to The Passage; she took Harry and I both there. I must have been 11 at the time, maybe 10,” William said. “I had never been to anything like that before, and I was a bit anxious about what to expect.”

William went on to explain that the experience opened his eyes to the privileges he’d grown up with, and made him realize that not everyone lived the same way he did.

“My mother went about her usual, making everyone feel relaxed, having a laugh and joking with everyone. I remember at the time kind of thinking, ‘Well, if everyone doesn’t have a home, they’re all going to be really sad.’ But it was incredible how happy an environment it was,” William said. “I remember having some good conversations, playing chess, chatting and that’s when it dawned on me that there were other people out there who don’t have the same life as you do.”