The Queen's first cousin and one of her most trusted confidantes, Margaret Rhodes, has died aged 91. Rhodes, whose aunt was the Queen Mother, died on Friday after a short illness, according to reports.
A spokesman for Buckingham Palace said it was not issuing a statement as it was a "private matter" for the Queen.
Rhodes, who was less than a year older than the Queen, spent her summer holidays at Balmoral with the Princesses Elizabeth and Margaret.
The Queen Mother affectionately called her her "third daughter".