"Angelina wants to make it as hard as possible," an insider tells the US publication.
"Brad was completely blindsided. This will take their custody negotiations to a whole new level of conflict."
Insiders have said Brad, 54, had believed the couple were making headway in their bitter custody water after Angie's endless smear campaign against him.
Besides that, Angelina and the kids - Maddox, 17, Pax, 14, Zahara, 13, Shiloh, 12, and twins Knox and Vivienne, 10 - have been living in their LA mansion.
"Brad loaned Angie the money for the down payment with the understanding it would provide a wonderful home - and give him the opportunity to regularly see the kids!"
Angie's plans to move the kids to France is "Brad's nightmare."
National Enquirer's source adds that's what "Angie's counting on."
Brad Pitt and Angelina Jolie are yet to respond to the National Enquirer's report.