Again. The mansions don't fall from the sky, they are built. Not every mansion has already been built. Why are you acting like people only buy pre-existing mansions?
You didn't give any specific example. You just keep repeating "but the mansions are already built", while mansions are being built right this second. If you want to introduce a specific scenario, you can't just expect the other person to read your mind, you have to do it.
How do you expect to share a mansion to buy some school uniforms, for example?
You only ever talked about mansions. You never specified anything about existing mansions or the like. This situation would be much less embarrassing for you if I couldn't scroll up and see everything you wrote.
Ok, you don't like mansions and can't produce any valid argument, fine. Let's talk about shares. You forcefully transfer £20m worth of shares from a rich guy into your name. What's next?