It was also claimed in the United States that the Duke and Duchess of Sussex only learned about Kate's condition at the same time the world heard the news.
A royal expert claimed Kate chose not to tell Harry and Meghan about her cancer because they 'can't be trusted', The Sun reported.
Harry is hoping to attend a service at St Paul's Cathedral in London to mark the tenth anniversary of the Invictus Games.
The solo visit - likely without Meghan and their two young children Archie and Lilibet - could be an opportunity to build bridges with his estranged brother William.
Sources close to William and Kate have suggested that, with both Kate and King Charles's cancer diagnosis, the 'Harry problem' is the last thing on their minds, according to The Telegraph.