Prince William's visit to the Child Bereavement Centre in UK opened up some buried wounds and feelings about his mother, Princess Diana, as well as anger over her death. While sitting quietly with Aoife, a nine-year-old, he exchanged feelings about the loss of his mother, and said he could understand her grief over her father's death.

He told her, according to the US magazine: "Do you know what happened to me? You know I lost my mummy when I was very young, too. I was 15 and my brother was 12. So we lost our mummy when we were young as well."

Another woman, Lorna Ireland, explained that the Prince had talked to her 12-year-old son also. The Duke of Cambridge talked about his anger and said he found it tough to explain his mom's death. The boy's mother said that the way Prince William spoke to her son was "very personal and very special."

For a long time, the Princes William and Harry had never revealed their feelings about their mother. The 22-year-old Prince Harry began to talk about his sorrow only in her 10th death anniversary, according to E!: "William and I can separate life into two parts," he said.

"There were those years when we were blessed with the physical presence beside us of both our mother and father. And then there are the 10 years since our mother's death. When she was alive we completely took for granted her unrivaled love of life, laughter, fun and folly."

The references to their mother has not been too frequent but Kensington Place released a clip showing the royal couple contributing to the 'Memory Jar' Support Group session, whose support group is designed to walk families through their different stages of mourning.

Now, the Child Bereavement Centre is celebrating its 21st anniversary, so Prince William talked about his mother. Being a Royal patron of this unit in UK since 2009, he said, "What my mother recognized back then - and what I understand now - is that grief is the most painful experience that any child or parent can endure."

But the Prince was always called "weak" if they made their wishes public. The Royal Family does not want to talk about its feelings publicly.

Now, both brothers are  different from the secretiveness that they felt at that time: "My mother died when I was very, very young and I don't want to be in the position. Now I'm so energized, fired up, to be lucky enough to be in a position to make a difference," explained Prince Harry.