Queen Camilla and Princess Anne are "so hard-working" while King Charles and the Princess of Wales continue to recover from surgery, it has been claimed.
Prince William has stepped back from royal duties while Kate, 42, recuperates from "planned abdominal surgery".
Therefore, the Queen, 76, and the Princess Royal, 73, have undertaken the majority of recent royal engagements.
Approximately 1,000 enthusiastic children in Bath greeted Camilla on Thursday.
Queen Camilla and Princess Anne are both in their 70s but continue to work hard
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She was celebrating the 850th anniversary of the St John's Foundation almshouses in Bath, which offer refuge to elderly people.
She informed Lisa Anderson, 90, over a cup of tea that her husband was "recovering well, thank you".
Despite her heavy schedule, the Queen never seemed tired and had a great conversation about the advantages of gardening and dancing, two activities she enjoys.
Looking smart in an Anna Valentine coat and Fiona Clare blouse, Camilla said of gardening: "It gets everybody outside, I find it the most relaxing thing in the world, you come in and everything starts stiffening up [but] it's worth it."
Queen Camilla greeting 1,000 children in Bath on Thursday
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Meanwhile, to manage her workload, Princess Anne has just announced the appointment of a new private secretary and named five new "Extra Ladies in Waiting", after four of her "older" ladies retired.
The princess, known for her no-nonsense attitude, has often demonstrated her nostalgic side.
Two of her new Ladies in Waiting were among the "head girls" that her mother, Queen Elizabeth II, had until her death.
A source told the Daily Mail: "She is so hard-working people can't necessarily give their lives over to support her, and nor would she want or expect them to.
Queen Camilla has worked very hard while her husband continues to recuperate
PA
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Princess Anne has just appointed five new Ladies-in-Waiting
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"Having a large number of effective part-time staff – friends – she can call on for help, without any cost to the public purse, when she knows she has engagements in a particular area, is an ideal solution."
Another added: "It's rather like having your own football team with a large number of reserves."
Princess Anne will also be standing in for the King and conducting extra investitures, such as the handing out of honours, while he recovers from prostate surgery.