The Monarchy and its working Royals are essentially funded by the Crown Estate, with the surplus passing to the Treasury.
The Queen's personal costs and upkeep of her private estates of Sandringham and Balmoral are funded by the Duchy of Lancaster estate.
The Prince of Wales and his family are funded by the Duchy of Cornwall.
The extended, non-working family receive no public funding.
This system would seem to me to be a very equitable arrangement, unless it is proposed to confiscate assets, aka the French Revolution.
It is notable that none of the current official working Royals are known to have a profligate lifestyle.
Any further costs incurred by the Royal family members specifically for carrying out official duties, paid by the Exchequer, are those which would still be incurred by a presidential system in a republicanconstitution.
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