Prince Charles, Camilla and Princess Anne are at Balmoral.
Prince William, the Queen's eldest grandson and second in line to the throne, is on his way there, while his wife Kate, Duchess of Cambridge, has remained in Windsor as her children are on their first full day at their new school.
Prince William's brother, Prince Harry, and his wife Meghan had been in the UK in recent days for engagements, and are now known to be travelling to Scotland too.