A trademark of the dynasty over its 140-plus years has been the remarkable unity it has maintained , despite major divisions that developed in the late 1970s , and unlike other wealthy families such as the Du Ponts and the Mellons .
A trademark of the dynasty over its 140-plus years has been the remarkable unity it has maintained , despite major divisions that developed in the late 1970s , and unlike other rich families such as the DuPonts and the Mellons .