The thinking and ability to do business and be a boss are the most valuable.
However, schools do not teach the thinking and skills of doing business and being a boss, because school teachers don’t know how to do it! You can only learn in the university of society.
Therefore, if your ancestors are not wealthy, what you need to do is to start sales early, then start a business, hone your selling skills to the extreme, go out into the world to understand human nature, expand unfamiliar markets, deal with all kinds of people, learn to distinguish people, identify people, conquer people, and manage people. This is the fastest way to cross classes.