Click here to see precise birth chart http://www.bemyastrologer.com/jolie%20pitt.jpg [right click chart to enlarge]
 
These kids are going to have a tough time with the Jolie-Pitt lifestyle and likely to have issues with Angelina.  Her troubled Saturn in Cancer sits on their Sun(s).  With Saturn and Mars together in the 9th house, they are not fond of travel, foreignors or even the principles of diversity.  Couple that with Mercury opposite Pluto and this might iindicate tough power struggles with siblings.  There are also signs of learning disabilities, dyslexia, asthma, ADD and nervous conditions.  These kids should definitely avoid sugar and preservatives and environmental chemicals.  They will also be  high strung and sensitive to noise.  They probably will enjoy being on the move school-wise because they have a "wild" side.  These kids could be real rebels!

Knox Leon and VIvienne Marceline?  Which one will be the intense Scorp and which one will be the controlled slightly arrogant Sadge?  [Twins tend to split a chart or share a personality range.  I'm an identical twin and you can believe this bit of astrolore.   It's true.]