What is the royal race row and why is it back in the news?

A book has named Charles and Catherine as royals alleged to have discussed skin colour of Harry and Meghan's unborn son

The royal race row that erupted more than two years ago, when the Duke and Duchess of Sussex told Oprah Winfrey that a member of the royal family had remarked on Prince Archie's skin colour before he was born, has simmered ever since. Now it has exploded once more as the Dutch version of a new book appears to have named King Charles and the Princess of Wales as family members alleged to have made such remarks.