There is a warning about family money that recurs in Arabic, in Chinese, in Italian and in Scots, and it takes roughly the same shape in each. The father acquires. The son maintains. The grandson disposes. The versions differ in their fourth act and in how much sympathy they extend to the grandson, though none of them treats the outcome as accidental.

What the proverb gets right is the timing. What it gets wrong is the cause. Fortunes of any size are rarely dismantled by a bad investment. They are dismantled by a disagreement that nobody was willing to hold in the open while it was still small, and by a founder who could not bring himself to write down what would happen after he was gone.

The founder's problem is that he has no problem.

A man who has built something over forty years does not need a governance framework. He carries the whole enterprise in his head. He knows which supplier can be pushed on payment terms, which manager will resign if a nephew is promoted over him, which of the properties is genuinely worth what the last valuation said. His judgement is fast because it is loaded with four decades of detail that was never written anywhere.

None of that is transferable. When the founder dies, what passes to the family is the balance sheet and none of the reasoning behind it. The second generation inherits a set of positions without the arguments that produced them, and it inherits them at the exact moment it must also manage grief, obligations to siblings and the question of who now speaks for the family in rooms where somebody must.

The mechanism of failure.

In Sapna Ventures' experience, wealth of the size discussed here falls apart along four seams.

The first is illiquidity meeting an unexpected demand. An estate settlement, a divorce, a tax assessment or a buyout of a dissenting cousin arrives, and the assets that would cover it are locked into vehicles with five years still to run. What follows is a forced sale in a bad month, and forced sales rarely stop at one.

The second is the absence of any agreed distribution policy. Where nobody has decided in advance how much the family may draw each year, every request becomes a negotiation, and every negotiation becomes evidence in the next one. Members who work in the business come to resent members who do not. Members who do not come to suspect that those who do are helping themselves.

The third is a governance structure that mistakes consensus for a decision-making method. Consensus works while a founder is alive to break the tie. Once he is gone, unanimity requirements hand a veto to whichever family member is angriest, and the portfolio drifts because nothing can be sold and nothing can be bought.

The fourth is silence. Families that have been prosperous for a long time develop an aversion to discussing money amongst themselves, on the grounds that it is vulgar or that it will upset somebody. The subject does not go away. It relocates to side conversations, to spouses and eventually to lawyers.

What appears to work.

The families that hold together across four and five generations tend to have done a small number of understated things early.

They wrote a charter while the founder was still alive and still capable of imposing it, and they wrote it when nobody was in dispute. A charter drafted during a quarrel is a treaty, and treaties are honoured only while the balance of power that produced them holds.

They fixed a distribution policy as a formula rather than a decision, so that the annual figure is arithmetic and nobody has to ask anybody for anything.

They established a room where disagreement is expected. The majlis survived in this region for centuries because it gave people of standing a place to raise objections in front of witnesses, under an obligation to be civil. Families that convene properly and regularly, with an agenda, with somebody keeping a record and with attendance treated as a duty as opposed to an invitation, discover their disputes at a stage when the disputes are still manageable.

And they wrote an exit. The most useful clause in any family charter is the one that allows a member who no longer wishes to be involved to be bought out at a formula price, without argument and without shame. Families that make leaving difficult convert every unhappy member into a permanent adversary. Families that make leaving easy find, more often than not, that fewer people leave.

The uncomfortable part.

Educating heirs is spoken about frequently and done badly. Sending a twenty-four-year-old on a two-day wealth seminar is not preparation for anything. What prepares a successor is responsibility with a real number attached, granted early enough that the mistakes are affordable.

Sapna Ventures has seen this handled well. A daughter given a genuine allocation and asked to defend her decisions at the family meeting each quarter learns more in two years than in a decade of observation. She also learns something the seminars cannot teach, which is what it feels like to be wrong in front of people whose good opinion she wants.

Capital held for those who come after is amanah. The obligation runs to the money and to the people who will one day be handed it, and the second half of that obligation is the one that families often forget.