Maybe your sister should be teaching you..? She might tell you to fuck off with the Ethereum crap.. she wants real money.. I.e. bitcoin.
And we're starting to get confused with him, because his brother is much more advanced in seeing the potential of bitcoin. Whereas if you look at the story, he understands bitcoin better than his brother, if the reason is risk as a consideration, it can be concluded which investment does not contain risk.
We think his brother's thinking is much more powerful and understands how bitcoin can provide something of value in the future, while his thinking is far downhill rather than growing.