And I read that to keep the riches among the families, they are encouraged
the arrangement of marriages among relatives. They are also good in taking
advantage of any situations to gain more. Like the Napoleonic war.
On July 18, 1815, a courier working for Rothschild informed the English government that Napoleon appeared to be suffering defeat at Waterloo. The English government, believing instead that they were losing the battle, dismissed the courier's report and believed it to be false information. At this point, with England's future seeming dire, Rothschild began selling all of his bonds, encouraging rumors that Napoleon had won and that English government paper would soon be worthless. Due to Rothschild's reputation as a influential, renowned and respected investor, the panicked English public followed his lead. The mass selling resulted in a total collapse of the English stock exchange. It was then that Rothschild's agents began snatching up bonds and stock at record-low prices. Two days later, when Wellington's envoy confirmed that Napoleon Bonaparte had indeed suffered a crushing defeat, Nathan Rothschild was effectively in control of the English stock exchange. As of 2015, the English government was still paying back money owed to the Rothschild family from this Napoleonic manuever.
Nathan's timing and frugality has led to the saying, "buy on the sounds of cannons, sell on the sound of trumpets," referring to the fact that the start of war is a good time to invest in a nation and that the end of war is the time to sell.
source: http://www.investopedia.com/updates/rothschild-family-net-worth-explained/
They are investing since the beginning of 1800's that why the family
has accumulated so much wealth distributed among the heirs all over
the globe.
Well, then he will make a marriage with a mere mortal? Then all their wealth during the divorce will be destroyed. So they marry only with their own in order not to lose their fortune