I see it mainly in Fantasy Books.
One Brother is the good one, he is manly, strong, don’t care about riches, and have a good heart. He will be the protagonist or the protagonist friend.
The other one is the Bad Brother, he have a more weak body, have femine traits, always using fancy clothes and jewels, is less loved by others, and he is jealous. He will be the antagonist.
In a arc of >!Ranger!< this trope is reverse, which was a breath of air.
And today, all villains must be rich white men. You can guess why.
Uh, because billionaires are villains?
Finally some realism
What do you mean “today”? The novels I read from the 1800’s are a goldmine of rich, white villains… it’s almost like they were always hated…