King Charles travelled to see his cherished former nanny, Mabel Anderson, at her residence near Frogmore on the Windsor estate, sharing tea with her to mark her centenary birthday.
The monarch honoured his longstanding promise to visit Mrs Anderson personally at the end of last week, despite navigating the aftermath of his brother's arrest.
Andrew Mountbatten-Windsor was taken into custody at approximately 8am on Thursday at Wood Farm, Sandringham, on suspicion of misconduct in public office, spending 11 hours with police.
The King reportedly only discovered the police action after it had occurred, with Palace officials stating they received no warning.
King Charles visited beloved nanny, 100, in days after Andrew arrest
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Mrs Anderson cared for all four of Queen Elizabeth II's children, tending to their daily practical and emotional needs as was customary for the era.
The King has spoken fondly of his nanny, whom he affectionately calls "Mipsy", describing her as "warm, loving, sympathetic and caring".
He has also credited her with being "a haven of security" during his boyhood, providing stability whilst his parents undertook extended Commonwealth tours abroad.
Ingrid Seward, writing in a 2024 profile, identified Mrs Anderson as one of the "women who raised a King", noting she "became a firm favourite with both the Queen and her children, particularly Charles", following more than three decades of service.
King Charles riding in his pram pushed by his nanny, Mabel Anderson, in 1950
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Their close bond has endured throughout the decades, with the King hosting a dinner celebration for Mrs Anderson at Clarence House when she turned 90.
During that period, he would reportedly arrange for a chauffeur-driven vehicle to collect her and bring her to Sandringham for Christmas festivities.
Following her lengthy service to the royal household, Mrs Anderson was granted a grace and favour residence in Windsor, where she continues to live today.
Such accommodation is traditionally provided to devoted staff members who dedicate their lives to royal service without earning substantial wages.
Mabel Anderson also looked after Andrew Mountbatten-Windsor, pictured here in 1966
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The centenarian will also receive a card and telegram from her former charge to commemorate the milestone.
The Royal Family gathered at St James's Palace on Tuesday for The Queen Elizabeth Prizes for Higher and Further Education, an event recognising exceptional work at British universities and colleges.
Queen Camilla, the Princess Royal, and the Duke and Duchess of Gloucester joined the King at the ceremony, representing the largest assembly of senior royals since Mr Mountbatten-Windsor's arrest.
Former nanny to King Charles, Mabel Anderson (left) and the Queen's lady-in-waiting, Mary Morrison, board the Hebridean Princess in Stornoway in 2010
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The Duke of Edinburgh withdrew from the engagement due to a cold, whilst the Duchess of Edinburgh is currently overseas in Somalia and Kenya working on preventing sexual violence in conflict.
Mr Mountbatten-Windsor was arrested and later released on investigation following the US Government's release of millions of documents connected to paedophile financier Jeffrey Epstein.
Andrew has consistently denied any wrongdoing.