09/04/2011 13:17 BST | Updated 22/05/2015 06:12 BST

Prince William And His Mother

"Never being able to say the word 'Mummy' again in your life sounds like a small thing," Prince William said at an event where he accepted his new responsibility as royal patron of the Child Bereavement Charity. "However, for many, including me, it is now really just a word – hollow and evoking only memories."

It's been 12 years since the 26-year old prince and his brother, Harry, lost their mother, Princess Diana, but William says not a day goes by that he does not think of her and admitted to a "grief that is never entirely lost."

Mother's Day will be celebrated in the U.K. at the end of this month and the charity, which Princess Diana was closely linked to during her life, is hoping its new Mother's Day campaign will raise awareness of the needs faced by those who have lost a child.

Looking slightly flushed, according to "People," William said he can, "wholeheartedly relate to the Mother's Day campaign, as I too have felt and still feel the emptiness on such a day as Mother's Day."
See our gallery below for photos of William and Harry with their mother and of the princes today.