The Prince of Wales, aged 40, reportedly adopted the Royal Family's motto of "never complain, never explain" and chose to remain silent despite the repeated swipes from the Duke of Sussex.
However, author Alexander Larman suggested that William should have agreed to an interview himself and extended the hand of brotherhood to avoid further attacks.
Larman said, "I'm on record as saying they should have responded. I think William should have given an interview in which he extended the hand of brotherhood. He should have said, 'We're all very concerned about him. We understand he had the most awful traumatic shock when our mother died so young. We know life has been hard for him.'"
The Royal Family's motto of "never complain, never explain" has served them well, but when a member of the royal family is not playing by the same rules, it raises concerns about the long-term consequences.
The royal commentator, author of "The War of Windsors," suggested that responding directly to Harry's claims could be the only strategy available to the royal family. He noted that the family had faced similar attacks from Edward VII when he abdicated and moved to France to marry his lover, Wallis Simpson. Larman implied that both the king and William might need to opt for reconciliation to prevent Harry from becoming a loose cannon, as the Duke of Windsor did.
Larman stated, "It was the same thing with the Duke of Windsor. He wasn't playing by any of the established rules because they'd all been torn up for him. So there wasn't an awful lot the family could do in order to rein him in. If you can't take his money away, you can't take his royal status away. What can you do?"
The King has extended an olive branch to his younger son and Meghan, the Duchess of Sussex, by inviting them to his coronation in May. However, the couple has yet to confirm whether they will participate.
Meanwhile, the Duke of Sussex's ongoing battle against the monarchy has led to further allegations against the institution. Just this week, the 38-year-old Duke claimed that the institution had conditioned him not to ask too many questions about alleged hacking against him and other royals.
Sources suggest that Harry's latest allegations have only solidified the Prince of Wales's belief that his brother is committed to embarrassing the family. A source told The Daily Beast, "William is over it at this stage.
If this was about his vendetta with the media, that would be one thing, but Harry keeps doing everything in his power to try to embarrass the family. How can you have a relationship with someone who's doing that?"
