It does depend on your definition of rich.
If you mean comfortable with a bit of spare money for nice things and a yearly holiday, that's easier.
If you mean able to put your DC through any uni and buy them a house afterwards, lots of luxury holidays etc, that's trickier.
My parents were very rich, and to be frank that gave me the skills and knowledge necessary to be able to do it myself, even though I walked away from them and their money it would be disingenuous to say it didn't give me a massive head start.
Knowing how "things work", how to move in certain circles etc (eugh that sounds gross) makes a huge difference.
My DH is career military (US) but grew up being pass the parcelled between foster homes. He's also an ethnic minority, so wasn't born with the white privilege or other societal advantages. Again gross to write but sadly true.
DH worked his way up primarily by doing the things others weren't prepared to do, volunteering for the postings nobody would touch with a ten foot pole.
Which is what I did too. There is money to be made doing the things most people won't - either because its grim dirty work or because it crosses one line or another.
I will add that neither of us has even broken the law, but I have certainly done some morally dubious things.
To be rich (as opposed to comfortable) you need to be ruthless, or have someone who is prepared to be rutess for you and have the price exacted from their soul instead of hour's.
Being rich doesn't come cheap.