They've both allegedly had possession of shocking tapes of one another which could derail the other's custody battle over their kids, but is Brad Pitt and Angelina Jolie's son Maddox really the one who holds some power in the fight?

According to a new report, Maddox, 15, may have tapes of nasty fights his parents have had over the years, and they don't show Pitt in the best light and could be exactly what Jolie needs to keep him from winning his bid for joint custody of their six children.

"Maddox is always on his phone and a lot of the time he's filming stuff," a source told Ok! (via Hollywood Life). "In the past year there've been some nasty blowouts between Brad and Angie that the kids were exposed to-that's why Angie thinks they need therapy-and Maddox would often find a way to listen in and even film a lot of their fighting. He's captured some moments that show Brad really losing his temper. Maddox has an incredible bond with his mother. His recordings could be a potentially damaging part of her arsenal against Brad."

The new report comes after Maddox was the child at the center of abuse allegations against Pitt, after he reportedly shoved the teen during a fight on an airplane in September, just one week before Jolie filed for divorce. Pitt was cleared of those charges last month.

The news also comes as news of another report surfaced which claims that Pitt is begging his ex-wife for time with the kids over Christmas

Another report (also via Hollywood Life), claims that even against the advice his legal team has given him, Pitt has even invited Jolie to tag along with the kids for a Christmas celebration because he's desperate to see the kids-but she continues to shockingly turn him down.

"Brad is stunned by the lengths to which Angie is going to seek revenge against him," a source said.

The alleged battle over Christmas comes after Pitt was not allowed to see the kids over Thanksgiving, or on his birthday on Dec. 18.

Tags: Angelina Jolie Brad Pitt