Mayer Amschel liked keeping things in the family, and as his family's empire expanded, he appointed each son to supervise each new city. He also favored arranged marriages to cousins to keep the wealth among the lineage. According to Business Insider, his will even outlined expectations for inheritance. "Mayer was concerned that the family's fortune would be diluted as it grew through marriages," according to the publication. "As such, his will 'barred female descendants from any direct inheritance' and, in effect, provided incentives for intermarriages. Four of his granddaughters married grandsons (first cousins), while one married her uncle."

The Rothschilds' power diminished in the 20th century, reported Finance Monthly. The Naples and Frankfurt branches died out when family members produced no male heirs. The Vienna and Paris sectors had their money confiscated during World War II. Still, the London branch remains and "is still a powerful force," per the website.

Today, the rich family is worth $400 billion, according to Celebrity Net Worth. The current Rothschild family includes billionaire environmentalist David Mayer de Rothschild; documentary filmmaker, writer, and a board member of several organizations, Hannah Mary Rothschild; financier Nathaniel Philip Rothschild, former co-chairman of the hedge fund Atticus Capital; and banker James Rothschild, who married another member of a business dynasty (hotels), Nicky Hilton, in 2015. 

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