A poignant message celebrating all mothers was posted online alongside treasured images which showed Charles as a beaming baby standing on the Queen’s lap, while an adult Camilla is seen smiling as she stands behind her elderly mother.
The Twitter post is accompanied by the message: “To all mothers everywhere, and to those who may be missing their mums today, we are thinking of you and wishing you a special #MothersDay.”
The Queen died in September aged 96.
Camilla’s mother Rosalind Shand died in 1994 at the age of 72 after a long battle with osteoporosis.
The Princess of Wales also shared photographs of happy family memories to mark the day.
The first image shows Kate sitting in a tree with her children Prince George, nine, Princess Charlotte, seven, and four year-old Prince Louis.
It is accompanied with the words “Happy Mother’s Day from our family to yours” along with a red love heart.
They are all casually dressed and smiling into the camera.
Another photograph shows a smiling Kate as she plays with Louis in her arms.