Over the years this core group has swelled in size and shrunk to a current standing of just 10 after both the Duke and Duchess of Sussex and Prince Andrew resigned from their royal duties in an official capacity.
And now, this number has shrunk temporarily to just eight individuals working on behalf of the Crown after the dual cancer diagnosis of both the monarch and the Princess of Wales.
Speaking with Sky News Australia, Peter Phillips revealed that his mother Princess Anne, uncle Prince Edward, and aunt Duchess Sophie were in particular under "enormous pressure" to pick up the slack.
"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 the responsibilities...that adds its own pressures," he shared.
"There is definitely a short-term pressure on certain members of the family to be able to continue to be out and about and to be seen and to support organisations and conduct official engagements that need to be done."
Who are the current working royals?
The Duke and Duchess of Gloucester
Prince Richard, 79 (also known as the Duke of Gloucester) is a first cousin to the late Queen and is the youngest of nine grandchildren to be born to King George V and Queen Mary.
He and his Danish-born wife, Brigitte, 77, (also known as the Duchess of Gloucester) share three children: the Early of Ulster, Lady Davina Windsor, and Lady Rose Gilman who all have children of their own.
It is unlikely that they will pick up the mantle from their parents when the Duke and Duchess eventually take a step back from royal duties.
The Duke and Duchess of Kent
Another first cousin of the late Queen, Prince Edward (also known as the Duke of Kent) is the fourth-born grandchild of King George V and Queen Mary.
The now 88-year-old has held his title since he was just six years old after his father tragically died in a plane crash.
He married Katharine, Duchess of Kent, 90, in 1961 and the pair share three children: Lady Helen Taylor, the Earl of St Andrews and Lord Nicholas Windsor.
Similarly to his cousin Richard, it is unlikely that his children nor grandchildren will ever become working royals.
The Duke and Duchess of Edinburgh
Formerly known as the Earl and Countess of Wessex, Prince Edward and his "commoner" wife Sophie (nee Rhys-Jones), work diligently on behalf of the Crown.
As the younger brother of King Charles, it is expected that the married couple of 24 years will continue as working royals, with the potential for their children Lady Louise and James, the new Earl of Wessex to also step up in the future.
Princess Anne
After marrying into the royal family through Princess Anne in December 1992, Sir Timothy Laurence, a retired Naval Officer opted out of becoming a working royal.
His wife however, Princess Anne was named the "hardest working royal" for 2023, carrying out an impressive 457 engagements, 32 more than her brother, the King of England.
Given the 73-year-old purposedly chose for her children Zara Tindall and Mark Phillips to not have royal titles like their cousins - with the hopes of them leading ordinary lives - we don't expect them, or Anne's grandchildren to become working royals in the future.
Princess Alexandra
The Honourable Lady Ogilvy was at one point sixth in the line of succession to inherit the British throne as the first cousin of the late Queen, she is now 57th.
As one of Queen Elizabeth's most trusted companions and friends, the Princess often accompanied her to her engagements, also carrying out engagements on behalf of her cousin alone.
The now 87-year-old was married to Sir Angus Ogilvy from 1963 until he passed away in 2004. The couple shared two children James and Marina Ogilvy who each have children of their own.
It is unlikely that they will become working royals in the future.
The Prince and Princess of Wales
Representing a revitalised, modern era of the royal family, it comes as no surprise that the future King and Queen Consort of England are working members of the royal family.
Given Prince William will one day become King, it is likely that the children he shares with his wife, Catherine Middleton will all one day pick up the mantle - especially Prince George who will also one day become King.
Who will become working members of the royal family in the future?
Given the current working group is ageing - with the exception of the Prince and Princess of Wales - and Duke and Duchess of Edinburgh it is expected that younger generations may soon step up, and away from their established careers.
In particular, Princess Beatrice may become a working royal given she is also listed as a Counsellor of State alongside Queen Camilla and Prince William.
As part of this role, Beatrice can be called upon to represent her uncle, including signing routine documents and attending Privy Council meetings.
Her sister Eugenie may also be asked to step up, alongside their cousins Lady Louise, and James, Earl of Wessex. It is highly unlikely that the Duke and Duchess of Sussex will ever return to the fold after their controversial 2020 exit.