A royal author has claimed that Prince Harry has been ‘hit hard’ by the news that Kate Middleton has cancer, and he knows that his brother and sister-in-law will be having a really tough time.

The Duke of Sussex arrived in London on Tuesday for the 10th anniversary of the Invictus Games and he confirmed to the New York Post that he won’t be seeing King Charles III due to the hectic schedule that the monarch is enduring since he returned to duties.

Houghton Hall: The luxury mansion where Kate Middleton can recover from her chemotherapy

Despite that, members of his family are supposedly firmly in his thoughts, particularly William and Kate.

Harry and Kate used to be close

“Harry would love to reconnect with Kate,” Christopher Andersen, who wrote “The King: The Life of Charles III,” told Fox News.

“They were once extremely close, and Harry was hit hard by the news of her cancer diagnosis, which he learned about just the way the rest of us did, via Kate’s shocking video.”

“Unfortunately, it doesn’t appear [Prince] William is willing to let his brother anywhere near his ailing wife,” he added.

Andersen said there has been “too much drama” between the two camps that has caused “lingering bitterness on everyone’s part.”

“The chances of even a meeting between Harry and the rest of the royal family, much less some sort of reconciliation, seem extremely slim,” he added.

It also seems that Harry is staying in a London hotel during his stay, having not been offered a place to stay at any of the royal residences during this visit.

Andersen’s insight comes just days after Kate and William’s close confidante Amaia Arrieta sensationally claimed that the pair are “going through hell.”

“I’m heartbroken at the moment, I think they are going through hell, I hope they will be back. It’s really personal,” Arrieta, who has worked as a stylist for Middleton’s three children since Prince George was a baby, told the Telegraph.