Mystery surrounds two royal siblings who reportedly up and left their grandmother Queen Elizabeth II's funeral early - before later returning outside with the rest of their family.

Princess Eugenie Stood in Solidarity With Her Sister, Princess Beatrice at the Queen's Funeral. The sisters stood side by side to bid farewell to their grandmother, the late monarch.

She is the niece of King Charles III and the granddaughter of Elizabeth II. At birth, she was 6th in the line of succession to the British throne and is now 11th. She is the younger sister of Princess Beatrice.

Princess Beatrice and Princess Eugenie appeared to leave Queen Elizabeth II’s state funeral early on Monday as millions of royal fans around the world tuned in to watch the service live.

Princess Beatrice and Princess Eugenie, the two children of the Duke and Duchess of York and grandchildren of Queen Elizabeth II, were spotted leaving the funeral before others in the congregation.

However, the two siblings were later seen outside Westminster Abbey with the rest of the royal family as the Queen's coffin was travelled out, The Sun reported.

Although Princess Beatrice and Princess Eugenie appeared to have not left altogether, it remains unclear exactly why they walked out of the service early.