Queen Elizabeth II, then Princess Elizabeth, with Prince Charles as a one-month-old. The portrait was taken by Cecil Beaton.

Princess Elizabeth with Prince Charles as a baby.

The future Queen Elizabeth II with Prince Charles in the drawing room at Buckingham Palace after his christening ceremony.

The then Princess Elizabeth, Prince Philip and a six-month-old Prince Charles.

Princess Elizabeth with Prince Charles as a baby.

Princess Elizabeth with Prince Charles and Princess Anne as a baby, on their way to Balmoral.

Princess Elizabeth and Prince Charles at Clarence House, watching a procession during the visit of Queen Juliana of the Netherlands.

The future Queen Elizabeth II with a young Prince Charles at London Airport.

The Queen with Prince Charles and Princess Anne at Balmoral.

The Queen and Prince Charles helping Princess Anne through an open window at Balmoral Castle.

Princess Elizabeth with Prince Charles in a toy car at Balmoral.

The Queen with Prince Charles at a polo match at Windsor Great Park.

The Queen and Prince Charles at Windsor Castle.

The Queen crowns her son the Prince of Wales at his Investiture at Caernarfon Castle, Wales.

Queen Elizabeth II and Prince Charles arrive on Baffin Island during a visit to Canada.

Prince Charles kisses his mother’s hand following a polo match at Windsor.

Prince Charles kisses the Queen’s hand when greeting her at the Chelsea Flower Show.

The Queen pictured with Prince Charles and Prince William at Clarence House.

The Queen, Prince Charles and the Duchess of Cornwall at the Braemar Gathering in the Highlands, Scotland.

The Queen and Prince Charles at the Chelsea Flower Show.

The Queen and Prince Charles with a copy of Queen Elizabeth, The Queen Mother: The Official Biography at Birkhall, on the Balmoral Estate.

The Queen and Prince Charles laughing together at the Braemar Gathering.

Prince Charles accompanying the Queen at the State Opening Of Parliament.

The Queen and Prince Charles at a Buckingham Palace state banquet for King Willem-Alexander of the Netherlands and Queen Maxima.

The Queen and Prince Charles at the Commonwealth Heads of Government Meeting at Buckingham Palace.

Prince Charles with the Queen at the State Opening of Parliament.

Another shot of the Queen and Prince Charles at the State Opening of Parliament.

The Queen and Prince Charles launching the Queen’s Green Canopy tree-planting initiative at Windsor Castle.

The Queen and Prince Charles walking on the Balmoral Estate, ahead of a tree-planting session for the Queen’s Green Canopy initiative.

The Queen and Prince Charles on the Buckingham Palace balcony during the Platinum Jubilee celebrations.