The Duchess of Cornwall and Cambridge remained in Windsor yesterday while William, Duke of Cornwall and Cambridge, and the Queen’s other children and Prince Harry traveled to Balmoral following the unusual statement from Buckingham Palace that “her doctors queen are concerned about Her Majesty’s health.” Kate stayed in Windsor with her and William’s three children, Prince George, Princess Charlotte and Prince Louis, as it was their first full day at school. Following the death of Her Majesty, aged 96, at one of her favorite residences, the official Instagram account for Kate and William shared the message released by Buckingham Palace. It read: “The Queen died peacefully at Balmoral this afternoon. “The King and Queen will remain at Balmoral this evening and return to London tomorrow.” The note was also posted on the gates outside Buckingham Palace, as is tradition after the death of a monarch. Queen Elizabeth II was the longest-reigning monarch in British history. After her death, her grandson Prince William and his wife Kate were given the titles, Duke and Duchess of Cornwall and Cambridge. READ MORE: Everything to be closed or canceled in the UK due to the death of the Queen The exact date has not been announced, although it will be confirmed by Buckingham Palace in due course. The procession is likely to take place at Westminster Abbey. Before that date, it is understood the Queen will lie in state at Westminster Hall for about four days. This will allow members of the public to pay their respects to the monarch of 70 years. In a statement, King Charles III said yesterday: “The death of my beloved Mother, Her Majesty the Queen, is a moment of greatest sadness for me and all my family. “We deeply mourn the death of a beloved Sovereign and a much-loved Mother. I know her loss will be deeply felt across the country, the Kingdoms and the Commonwealth, and by countless people around the world. “During this time of mourning and change, my family and I will be comforted and sustained by our knowledge of the respect and deep affection in which the Queen was so widely held.”