"Shirtsleeves to shirtsleeves in three generations" seems to have equivalent, independent expressions in many languages.
Be careful to not reproduce in excess. This is the main thing. You don't want wealth to divide too rapidly between quick generations. Ensure you invest heavily in training people to teach them how to grow their wealth through age old tested ways: Gold, Real estate, well trained children. Ensure your accumulation rate is above your spending rate.
Modern day trusts too come to mind. Kennedy's, Clinton's, Rockefeller's and Rothschild's of the world.
Wealth doesn't last for long if you don't have the discipline for it. Most people who tend to lose wealth are generally the ones who completely lose a grip on reality. Deviate so far away from the very reasons that bought them there. Bad things happen from there on.
Or, alternatively, reproduce abundantly and use your children to make alliances with families that actually do matter.
You're advocating having few children in a thread related to Saudi Arabia, a kingdom whose founder had 20+ wives and some 100 children. That is how all the warring clans in the Arabian Peninsula were united and pacified: by marriage.
An inheritance split between 100 children, and then split again between their children a generation later is going to run out pretty quickly.
Even if it's only 4-5 children per person it will run out within a few generations.
Also, why should all children inherit equally? Marry the daughters into wealth, and make sure only capable sons inherit.
In an ideal world, that's a great idea. In reality, see above about camels, Mercedes and Lamborghinis.
You can reproduce in excess, but you have to practice primogeniture.
>70% of wealthy families lose their wealth by the second generation, and a stunning 90% by the third, according to the Williams Group wealth consultancy.
>It takes the average recipient of an inheritance 19 days until they buy a new car
The beloved leaders have reached the third generation: that could represent some hope to North Korea inhabitants.