Prince William and Princess Kate’s relationship with Prince Harry remains in tatters behind closed doors despite the birthday message posted from the royal couple’s social media account. The Duke of Sussex celebrated his 40th birthday on Sunday. He received public birthday wishes from King Charles’s Royal Family account and Kate and William’s account on X, formerly known as Twitter. The Royal Family account posted at 8:28am on Sunday morning: “Wishing The Duke of Sussex a very happy 40th birthday today!” The post was accompanied by an image of Prince Harry smiling. Interestingly the image used…