The wealthy people I know (including my dad) all have somewhat similar stories. They had a talent or a skill that they found a way to market, and they were relentless in their pursuit of success. My grandparents were hardly middle class much less wealthy, and of the family friends that I'd call wealthy, very few were born into rich families. It's not common you actually lay eyes on someone in the act of relentlessly pursuing wealth, because they're always working. My dad was/is never home. The only bit of advice he's ever given me is to either be earning, or looking for ways to refine your skills so you can earn more. That, and to maintain relationships and never burn a bridge with anyone ever because you never know when you might need to call on them. He knows literally hundreds of people by name and most people think he's the nicest person ever.
You can call me lucky for being born into my family, but it's not like I get to sit back and let the good life carry me where it will. I'm no trust fund slacker, nor would my family ever let me be one. I put in an average of 50 hours a week at one of the family businesses on top of school, and it's no cushy "stand around with my thumb up my dumb ass" kind of job either. It's easy to rationalize that having money is a matter of luck, and to be sure there is some luck involved, but on top of that luck is a work ethic that most people don't have.