Princess Beatrice and Princess Eugenie “will do what they can” to support Prince William, according to royal sources. Over the last few months, there has been much speculation over whether Beatrice, 35, and Eugenie, 34, may take up official royal duties. This speculation increased after the York Princesses stepped out to support the Prince of Wales alongside Peter Phillips and Zara Tindall at the Buckingham Palace garden party last week. It is thought the younger royals were drafted in to help because of the “unique circumstances” Prince William is facing as his wife Princess Kate continues to…