The best way to “improve†people… Simply get them out of toxic environments! Know who the bad apples are,,, and have them stay away!
So whether that is somebody in the family… or extended family. Who they might be… Certain in-laws,,, whether uncles or aunts, cousins even siblings etc…
Even maybe for the toxic people… To untoxify them, or to detoxify them… Or make them not toxic anymore, just ship them off to somewhere else?
Put people in a pleasant place or a pleasant environment, and see how they change or don’t change? This is the ultimate marker of things.