The Duke of Cambridge and Prince Harry have left the London Clinic in central London after visiting the Duke of Edinburgh, who is recovering in hospital after exploratory abdominal surgery.
Prince Charles and the Duchess of Cornwall also visited Prince Philip.
The Queen visited Prince Philip in hospital as the Palace described him as "comfortable and in good spirits" following an operation.
The Duke of Edinburgh will celebrate his 92nd birthday, as he did Christmas in 2011, in hospital.
Buckingham Palace say they expect him to remain there for up to a fortnight, but did not say what the exploratory operation was for.