The Countess of Wessex was seen placing a comforting hand on Prince George's shoulders as he attended his great-grandmother's funeral.
The nine-year-old future king could be seen walking ahead of his seven-year-old sister as they joined the procession behind the Queen's coffin as it was carried by the military bearer party.
During the service, Charles was visibly moved and looked close to tears as the national anthem was sung, and Prince George was also comforted by his mother, the Princess of Wales, during the service.
Princess Charlotte and Prince George became the youngest royals to take part in a royal funeral procession as they took on the public-facing role today.
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Sophie could be seen dabbing an eye later on during the funeral, while Princess Beatrice looked overcome with emotion at one point.
On Saturday evening, Prince Edward and Sophie watched on as their children Lady Louise Windsor and James, Viscount Severn, stood next to the Queen's coffin
Sophie watched on in tears on as the eight grandchildren guarded their grandmother's coffin, with her daughter Lady Louise Windsor, 18, and son, James, Viscount Severn, aged 4, taking part.
The Wales' children both attended Prince Philip's memorial service in March, and are expected to attend the committal service later in the afternoon at St George's Chapel, Windsor.
The heir to the throne after William, Adrianne Carter, the Face Whisperer said she felt that younger sister Charlotte understood royal protocol and instinctively let her brother go ahead.
She said: "We see Charlotte move back to let George take the lead. Camilla goes way ahead as they enter almost as if she’s on her own.
"They (Charlotte and George) do show maturity but not a heavy weight on them. They look like they are well prepared but not scared of their roles today.”
Speaking about her children, The Princess of Wales shared yesterday how they are coping with the death of their beloved 'gan gan' - a family nickname.
Chatting with Australia's Governor-General at a reception held for Commonwealth dignitaries ahead of the Queen's funeral today, Kate explained George is beginning to understand the significance of his great-grandmother.
David Hurley recalled his conversation with Kate, saying she revealed her eldest son, is 'sort of now realising how important his great-grandmother was and what is going on'.
As the procession left Westminster Abbey for Wellington Arch, members of the royal family watched on.
The Queen Consort, the Duchess of Sussex, the Princess of Wales and the Countess of Wessex were seen looking sombre as the King and his siblings marched off.
Prince George and Princess Charlotte stood in front of their mother, with George looking directly at the coffin as it passed.
