Princess Beatrice and Princess Eugenie have been tipped to step up to fill in the “major absence” of senior royals. The Firm has pulled together in recent weeks after King Charles III and Princess Kate announced they were both battling cancer. Buckingham Palace was expected to look to slim down before the diagnoses, with Megxit creating instability. Royal expert Phil Dampier said: “I know that Bea and Eugenie are willing to do more and would happily help out. They just need to be given the green light.” He added: “With the King and Princess of Wales battling cancer and with Harry and Meghan an…