The latter consisted in large part of property (Sandringham and Balmoral are privately-owned), furniture, art, jewellery left by the Queen Mother to the current Queen (some of which was then gifted to the state) and an investment portfolio...which no-one actually anything about (it is not large) but which was all acquired privately (both Sandrigham and Balmoral were bought on the open market by Queen Victoria).
To suggest they have "so much of the country's wealth" is wildly inaccurate though (most estimates are $500m, and that is including the Duchy of Lancaster/Cornwall...she benefits from the income of both but they are not owned by her personally). The Royal Family aren't even the wealthiest members of the aristocracy in Britain (or anywhere close, frankly).
Btw, it is worth remembering that we executed our king ~500 years ago when he got out of line. This isn't our first rodeo.