I know a few very high achieving individuals:
One had a terrible background, is the only successful one out of their siblings and is very driven and disciplined. Very successful multimillion pound business.
One grammar school educated, innovative tech during 1980s/1990s- hardworking but working class parents.
One has 2x teacher parents, state educated, did maths degree, successful city career.
Families: tend to prioritise education, have positive attitude to overcoming obstacles, hard working parents (both educated to a high level themselves or immigrant parents who worked very hard in variety of low paid jobs), high expectations of their children and quite a good level of support for them in various ways. Often combination of genetics, luck, money, drive and resilience passed down. Encouraged professional jobs that are well paid and highly skilled, eg medicine, law, dentistry etc.