Brad Pitt has a loved one firmly in his corner as he struggles to finalize his divorce from Angelina Jolie — his devoted mom, Jane!

Pitt, 55, and 43-year-old Jolie may be attempting to negotiate a truce, but the same can’t be said about the angry grandma to the couple’s kids — Maddox, 17; Pax, 14; Zahara, 13; Shiloh, 12; and 10-year-old twins Knox and Vivienne.

“Jane is a tough cookie, and she will never forgive Angelina for what she’s put the family through — especially since they’ve barely seen the kids since the divorce was announced,” an insider exclusively told Breaking Celebrity News.

“She thinks her son has been treated in a cruel and manipulative way, and she’s not letting this go,” added the source.

As Breaking Celebrity News reported, before the divorce is all over, Pitt could be out as much as $100 million as he and Jolie work out the final details of their split and custody of the kids.

"Brad’s had to beg his mom not to jump on a plane to confront Angie numerous times, but she wants to look her in the eye and give a piece of her mind,” said the insider. “She blames her for her ruining her son’s life and wants answers.”