Large family holding companies: undefined objects?

After forty years of strong growth of the world economy and stock markets, the acquisitions and disposals resulting from industry restructurings have generated a significant number of large family holding companies, whose ambitions go beyond the mere risk diversification of their wealth.
Today in the United States, there are more than 900 family holding companies with more than 500 million dollars of assets, including 400 with more than 1 billion dollars of assets and 25 with more than 5 billion dollars (on average, the stake in the historical company represents less than 50% of the total). Globally, the number of these holding companies is growing by 18% per year.
Some of these holding companies, especially when they are newly created, have difficulty defining their positioning, their strategy, and therefore their organization.