Biographer Penny Junor said the Queen is showing other vulnerable people it's okay to miss Christmas this year.
The Duke of Edinburgh wrote to actor Lionel Jeffries to thank him for his sympathies after Lord Mountbatten was killed.
The Duke of Edinburgh made a rare statement during his retirement as he thanked those working for a vaccine.
Royal expert Victoria Arbiter has defended the Queen's decision not to visit the Duke of Edinburgh while he was in hospital.
Prince Philip was admitted to the King Edward VII’s hospital in central London on Friday for observation and treatment relating to a pre-existing condition.
Britain's Prince Philip, the 98-year-old husband of Queen Elizabeth, was taken to hospital on Friday as a precaution for treatment of an existing condition, Buckingham Palace said. Philip, whose official title is the Duke of Edinburgh, travelled from the royal family's Sandringham home in Norfolk, eastern England, to the King Edward VII Hospital in London for observation and treatment, the palace said in a statement.