The Apple family empire is run by Applejack, Brina Cupcake, Apple Bloom and Red Baroness.  
Every major change goes through these four, however, Brina in later years has the final say. The Apple empire deals with inner conflict, business, and finances as well as agricultural real estate [mostly leaving the “fancy mathematics” to Jet Set and Big Mac]
 
They all have different roles and views. Red is not phased by emotions. She’s ruthless and doesn’t respond well to emotional tactics.  
Apple Bloom is surprisingly cutthroat as well. She’s a fair bit smarter and more experienced than Red and understands when to push for a better deal and when to settle.  
AJ is the calmest of the four. She can sense when people are lying but also can understand the depth of those lies. She’s a practical mare who’s most concerned about her family first.
 
Brina is an amalgamation of them all, while also having a kinder approach. She’s gentle but shrewd.