Miguel Bezos was an engineer, and manager at ExxonMobil, and he gave Jeff Bezos a $250,000 loan in 1994 (approximately worth $500,000 today).

Miguel Bezos Dad was also a lumber business man in Cuba before Fidel took over but Miguel started over from scratch because of Fidel.

So I would say had Miguel Bezos dad been able to keep his business then Jeff's adopted grandfather would be a self made man instead of Miguel but Miguel started from $0 also.

But Jeff's biological dad, also was a small business owner, which is technically self-made but I feel like it's not as impressive tbh as starting from $0 in a new country.

Jeff Bezos had a stable economic position which benefited him in a manner that allowed him to take risks other people might have not been able to.