"The AAMC explains that the percentage of medical students from families in the highest quintile of household income has not dropped below 48 percent since 1987—half of students come from the richest 20 percent of the population—while the percentage of students from the lowest quintile has never risen above 5.5 percent [9]"
https://journalofethics.ama-assn.org/sites/journalofethics.a...
This is anecdotal, but my elementary school class was full of doctors kids and I can tell you that the doctor parents would almost disown their kid if they didn't get into medical school. Doctors seem to have a very strong opinion on the medical field being the only right option.
So in that sense it's more of a correlation with money, and a causation through inheritance.
In my case.... my dad is a doctor and it was sort of expected I become one myself. Its not my thing though, or it wasn't at the time so now (like a lot of people on this forum) I work in engineering. In a way I do regret it now, because I wish I did something "useful" to society.
My younger sister however, did go to med school and is about to finish. She was very driven from a young age - I don't remember her saying she wants to become anything else but a doc. When her and my dad talk, I feel a little left out and only occasionally I have the feeling they look at me and shake their heads.
That's a claim a lot of people make (I think I'd probably agree with it), and the parent comment is disagreeing.