Britain’s royal family has publicly wished Prince Harry a happy birthday, their first such message since 2021 to mark the milestone of his turning 40.A post was shared on X and Instagram with the message: “Wishing The Duke of Sussex a very happy 40th birthday today!”It was accompanied by an image of Harry smiling and a birthday cake emoji.An hour later, the post was shared by Prince William and Catherine, Princess of Wales, who added their own message: “Wishing a Happy 40th Birthday to The Duke of Sussex!”The public well-wishes could come as a surprise with Harry known to be estranged from his brother and having difficult ties with his father, King Charles III.Prince Harry and Meghan, Duchess of Sussex, have been living in California since 2020 after stepping down as working members of the British monarchy.Since then relations have been strained, in particular over the release of Harry’s memoir …