United Kingdom, March 25 -- Princess Anne is feeling the "pressure" of taking on more royal duties while her brother, King Charles, battles cancer.

The 75-year-old monarch has stepped away from public-facing engagements while receiving treatment, leaving senior royals including wife Queen Camilla, and his siblings the Princess Royal and Prince Edward, the Duke of Edinburgh, stepping up to take on more tasks, and Peter Phillips - the son of Anne and her first husband Captain Mark Phillips - admitted they are all feeling the streain.

Speaking to Sky News Australia, Peter said: "Everyone has their own different role to play.

"There's a lot of pressure on the Duke and Duchess of Edinburgh, my mother and the Queen to take on a lot more of t...