Prince Harry's father, King Charles III, and brother, Prince William, did not meet with him or show him their support during his visit.
ET chats with royal expert Katie Nicholl about Prince Harry returning to London for the 10th anniversary of the Invictus Games.
Royal expert Katie Nicholl told ET that there is 'genuine sadness that he hasn't got to see his father.'
His Majesty appointed William Colonel-in-Chief of the Army Air Cops on Wednesday.
The decision comes as Prince Harry is in the UK for the 10th anniversary of the Invictus Games.
The Duke of Sussex founded the games after his time in the British Army.
A spokesperson for the Duke of Sussex explains why Prince Harry won't see his dad amid his cancer treatment and return to duties.
King Charles and his niece, Zara Tindall, had an emotional reunion at the Windsor Horse Show as he battles cancer.
Zara Tindall was quick to show affection to the king, who is her mom's brother.
King Charles and Queen Camilla were spotted meeting with patients at a cancer center following the king's cancer reveal in February.
Royal expert Katie Nicholl chats with ET about King Charles' desire to reconcile with Prince Harry following his cancer diagnosis.
King Charles stepped out with Queen Camilla for his first official public event.
The palace released a statement stating that King Charles will return to his royal duties after his cancer treatment.
The monarch is currently undergoing treatment amid his cancer battle.
