The strained relationship between Prince William and Prince Harry, once a cornerstone of the royal family, took a surprising turn when William and his wife, Kate Middleton, publicly extended birthday wishes to Prince Harry on his 40th birthday last week. The move, described as "unexpected" by royal experts, has sparked speculation about a potential softening of the long-standing tensions between the brothers, largely attributed to Kate's influence.

While neither William nor Kate personally penned the birthday message, the public gesture of goodwill has caught the attention of royal commentators, given the deep rift between the siblings. Former BBC Royal correspondent Jennie Bond told OK! that she believes Harry would have been pleased by the message. "I still think things are too sensitive for a meaningful reconciliation with William, but the fact that he and Catherine authorized the greeting to be posted is definitely an unexpected turn of events," Bond said.

The gesture comes at a time when significant birthdays often lead to personal reflection. Jennie Bond speculated that Prince William might have been doing some "re-evaluation" of his relationship with Harry. This subtle shift in William's stance is thought to be partly influenced by Kate Middleton, who has long emphasized the importance of family and reconciliation.

Kate's influence on William's decision to acknowledge Harry's birthday has led some experts to wonder if the Princess of Wales is playing a quiet role in softening her husband's once firm position. Bond added, "My gut feeling is that Catherine has been influential in this slight softening of her husband's implacable stand against Harry. She has always prioritized family, and her recent health battles have given her a new perspective on the value of family ties."

The bond between Kate and Harry was once close, with the two often seen laughing together at public events. Kate was known to serve as a peacemaker between the brothers when disputes arose. However, the relationship deteriorated after Harry and Meghan Markle made a series of explosive allegations against the royal family. Kate's friendship with Harry has never fully recovered since.

Omid Scobie, author of Endgame, suggested that there may be "no going back" for Kate and Harry's relationship. "She was close to Harry, and she will always look back fondly on those moments... but to her, there is no way she could ever trust them after all their interviews," a source told Scobie.

Despite the damaged relationship, recent reports indicate that Kate's recent health struggles may have prompted Harry to reflect on family ties. A source told Closer magazine, "Although a lot has gone on, times like this have reminded them that life is short and family is important. It obviously won't heal everything overnight, but it has made Harry think about things differently."

The source noted that the emotions stirred up by Kate's health issues may have led to a sense of guilt for Harry over the widening distance between himself and his family, particularly with William and Kate. "Harry still loves his father and sister-in-law, and that has never changed, despite everything," the insider added.

Kate Middleton's public acknowledgment of Harry's birthday also comes after revelations that William viewed Harry's perceived swipe at Kate in his Netflix series as a deep betrayal. A confidant of William described the comments as the "lowest of the low" and a critical point in their estrangement.

Yet, in light of recent events, it seems Kate's approach has shifted toward healing old wounds. In her recent public appearance discussing her recovery from chemotherapy, Kate spoke about the renewed importance of family and love, sentiments that may have influenced William's softened stance toward his brother. "What clearly matters to her more than anything now is family, and loving and being loved," Bond said, suggesting that Kate's journey has emphasized the need to prioritize family relationships over past grievances.

Despite the apparent thaw, experts caution against viewing the birthday message as a signal of a full reconciliation. "We shouldn't hold our breath for this to really signal the start of a reconciliation, but it was an unexpected turn of events," Bond warned.