Prince William and Kate Middleton's relationship with Prince Harry has been greatly impacted by the latter's memoir, "Spare," in which the Duke of Sussex painted the future king and queen negatively, according to royal commentator Richard Fitzwilliams. Speaking to GB News, Fitzwilliams stated, "It may be things are going on that are not known, but it was not a surprise given Prince William's intense feelings. He was appalled by the allegations in Spare."

The royal commentator further emphasized the sensitive nature of the current situation, saying, "Given it is a deeply pressured and sensitive time for William, Catherine and their family, I don't think anyone expected Harry would see them." Fitzwilliams also addressed the confusion surrounding Prince Harry's lack of interaction with King Charles during his recent UK visit, adding, "They did think he would see King Charles and he didn't, it has been disputed as to why."

The strain on the relationship between the Wales and the Sussexes has been exacerbated by the ongoing health challenges faced by Kate Middleton and King Charles, both of whom are undergoing cancer treatment. A source previously told OK! that the Wales don't want to be around the Sussexes during this difficult time.

Tom Bower, another royal commentator, echoed this sentiment, telling an outlet, "Not only is there the pressure on William, but also the constant sniping from California. I'm sure he's furious with Harry, he's behaved appallingly." Bower also criticized Prince Harry's brief visit to the UK after King Charles' cancer diagnosis, saying, "After Charles' diagnosis, Harry came over for half an hour, and that's it, he's done nothing else. I can imagine that Kate and William are deeply upset by having the Sussexes' brand operation rubbed in their face while they're going through this tragedy."

In March, Kate Middleton returned to Instagram to update fans on her health after avoiding the spotlight for months. In a heartfelt video, she thanked supporters for their messages of support and understanding while she recovered from surgery. The Princess of Wales revealed that she had undergone major abdominal surgery in January, and while the surgery was successful, tests after the operation found that cancer had been present. As a result, her medical team advised her to undergo preventive chemotherapy, which she is currently in the early stages of.

Kate acknowledged the shock and difficulty of the situation for her entire family, especially for her young children, Prince George, Princess Charlotte, and Prince Louis. She emphasized the importance of having Prince William by her side as a source of comfort and the love and support shown by so many. The Princess of Wales also requested time, space, and privacy for her family as she completes her treatment, while expressing her thoughts for those whose lives have been affected by cancer.

Despite the tension between the two couples, Meghan Markle and Prince Harry released a statement in support of Kate, wishing her "health and healing" and hoping that the family can navigate this difficult time "privately and in peace."

The ongoing strain in the relationship between Prince William, Kate Middleton, and Prince Harry has been further highlighted by the lack of interaction between the royals during the Duke of Sussex's recent trips to the UK. A royal source told the Mail that Princess Kate is "in a very different position" to King Charles, who recently returned to public-facing duties. The source emphasized that no one wants to put any pressure on the Princess of Wales and that the only thing that matters is her recovery.