Bradd Pitt

In the documents obtained by CNN, Pitt alleges that his estranged wife is "determined to ignore even agreed upon standards relating to the children's best interest."

Pitt asserts Jolie has "no self-regulating mechanism" when it comes to preventing sensitive information from going public -- citing the names of therapists working with the family that were made public in Jolie's previous court filings.

The two attended the 2015 British motorcycle Grand Prix, aka the MotoGP World Championship, at Silverstone in Northampton, England. Sporting noise-cancellation headphones, the boy and the 51-year-old actor, a biker himself, watched the race with his dad. Pitt and Knox then met with winner and Italian racer Valentino Rossi and posed for group photos.