Do Family Fortunes Really Disappear by the Third Generation?

There is a famous rule in wealth management: 70% of wealthy families lose their wealth by the second generation, and 90% lose it by the third.

You’ve probably seen those numbers repeated so many times that they now sound like compound interest formulas. However, they are not.

The underlying research is considerably weaker than the neat percentages suggest. A 2022 review by family-wealth researcher James Grubman traced the famous “70% rule” back to older family-business research with serious methodological limits.

CFA Institute has since highlighted the same problem when examining the so-called third-generation curse.

That does not make generational wealth loss imaginary. Family fortunes clearly shrink, fragment, and disappear. The real question is why.

Once you look at the math, family structure, business risk, spending, and succession planning, you do not need a mysterious three-generation curse to explain much of it.

Where the 90% Statistic Comes From

The standard story goes like this:

The numbers are commonly associated with work by Roy Williams and Vic Preisser and their book Preparing Heirs.

Wealth-management firms still cite research involving thousands of affluent families as evidence that the pattern is remarkably consistent. Moran Wealth Management is one example. The problem appears when you follow the evidence farther back.

Grubman’s review found that the supposed 70% failure rate ultimately depended heavily on a 1987 study of roughly 200 family businesses in Illinois manufacturing.

Success was measured by whether majority family ownership passed to the next generation. That is a very specific definition involving a very specific group of companies. It is a long way from proving that 70% of family wealth disappears.

He also raised questions about later Williams and Preisser research. Some participants came from a CEO peer network, and another group consisted specifically of people referred after experiencing family-succession failures.

The research mixed business succession with financial-asset transitions, even though selling a family company successfully can end family ownership and increase family wealth at the same time.

Bear that distinction in mind.

If Grandpa sells the family manufacturing company for $80 million, the business has failed the “family ownership survived” test. His family might now own $80 million of diversified investments. Calling that wealth destruction requires some creative accounting.

Wealth Shrinks Even Without Squandering

There is another piece of the third-generation story that receives far less attention: basic division.

Imagine a founder dies with a $60 million estate and three children. Ignore taxes, investment returns, gifts, and spending for a moment. Each child receives $20 million.

Those three children eventually have six children between them. Divide the same family capital again, and each grandchild receives $10 million.

The family still owns $60 million collectively.

The individual fortune has gone from:

$60 million → $20 million → $10 million

Nobody bought a yacht. Nobody invested the inheritance in a cousin’s cryptocurrency startup. Nobody forgot the password to the brokerage account. The family simply became larger.

Add inflation, decades of living expenses, charitable giving, taxes, divorce settlements, homes, education, and normal consumption, and the apparent decline becomes easier to explain.

A fortune can therefore become less impressive on a per-person basis even when the family handles the money reasonably well.

Wealth Rank Is Also Hard to Preserve

A useful piece of independent evidence comes from a 2025 NBER paper examining elite American wealth historically.

Researchers Priti Kalsi and Zachary Ward found that having a wealthy grandparent substantially increased a person’s chances of reaching the economic elite.

At the same time, more than 90% of grandchildren of grandfathers in the top 1% did not themselves reach the top 1%.

That study examines historical U.S. populations rather than today’s wealthy families, so you should not use it to manufacture another universal rule.

It does demonstrate something important.

Staying extremely rich is difficult.

Economic rankings are relative. A grandchild can inherit considerable wealth, live very comfortably, and still fall outside the top 1% because other fortunes grow faster.

Losing elite status and losing the inheritance are two different events. Wealth statistics become much more interesting once we stop treating them as the same thing.

The Family Business Creates Another Risk

Many large fortunes begin with a concentrated asset: one company.

That concentration is fantastic when the company is growing. It creates billionaires much faster than a balanced portfolio of index funds and municipal bonds ever will. It also creates succession problems.

The founder might understand the company better than anyone alive. The next generation inherits ownership without automatically inheriting the founder’s judgment, customer relationships, appetite for risk, or ability to run the operation.

Now add siblings.

One wants to reinvest profits. Another wants dividends. A third wants to sell. A fourth works 60 hours a week inside the company and resents cousins collecting distributions from the beach.

You can see how a balance sheet becomes a family argument fairly quickly.

Selling the company can solve that problem. Keeping it can also work. The dangerous arrangement is unclear ownership combined with unclear authority.

Succession Planning Still Has a Real Problem

The questionable 90% statistic should not distract from better modern evidence showing that wealthy families have genuine preparation gaps.

Deloitte’s 2024 family-office research found that 41% of surveyed families had no succession plan even though 41% expected a generational succession within ten years.

Thirty percent of respondents described the next generation as unprepared, and 28% described them as unqualified to take over.

UBS found similar problems in its 2026 Global Family Office Report. Only 35% of surveyed family offices had a defined succession plan for the office itself, and just 27% had a structured process for educating and preparing heirs for future responsibilities.

Those figures tell us considerably more than an old proverb does.

A family can hire brilliant investment managers, estate attorneys, accountants, and tax specialists. Eventually somebody in the family still needs to know what the assets are, why they are owned, who makes decisions, and what the money is supposed to accomplish.

Money can hire expertise. It cannot outsource every decision forever.

Communication Matters Because Money Creates Decisions

The three articles that prompted this discussion all emphasize communication, education, governance, and preparation. Cendrowski Corporate Advisors points to financial education, clear governance, shared values, and leadership development.

Moran Wealth similarly emphasizes governance and next-generation preparation. CFA Institute reports that advisors increasingly involve heirs in financial education and family decision-making.

The financial-literacy part is occasionally overstated.

A third-generation heir does not need to become Warren Buffett.

They need enough knowledge to recognize leverage, understand cash flow, evaluate fees, question an investment proposal, read basic financial statements, know when professional advice is needed, and avoid signing something simply because a confident person put it in front of them.

That is a much more achievable standard.

What Actually Gives Wealth a Better Chance of Lasting?

For a family trying to preserve capital across generations, it’s important to pay attention to five things.

• Clear ownership. Everyone should know what they own and what rights come with it.
• Diversification. A fortune built through one concentrated business does not automatically need to remain concentrated forever.
• Succession planning. Leadership transitions should begin years before the founder becomes unable to make decisions.
• Financial education. Heirs should gain experience with money before receiving life-changing amounts of it.
• Governance. Families with shared assets need rules for distributions, voting, employment, investment decisions, and conflict resolution.

None of that sounds particularly glamorous. Neither does bookkeeping. Businesses tend to notice when nobody does it.

There Is No Expiration Date on a Fortune

The third-generation curse makes a wonderful story: one generation builds the fortune, the next enjoys it, and the grandchildren finish the job. Still, the reality is messier.

The famous 70% and 90% figures do not have enough evidence behind them to function as laws of wealth. Modern research still shows meaningful succession and education problems among wealthy families.

Family fortunes also face entirely ordinary arithmetic: more heirs, more spending, more years, more decisions, and more chances for something to go wrong.

That is the more useful part.

A family does not reach the third generation and suddenly activate some financial self-destruct mechanism.

Fortunes have to survive decades of inflation, consumption, investment risk, business transitions, family growth, taxation, and human decision-making.

Keeping money for 75 or 100 years is difficult. It does not require a curse to make it so.