Brad Pitt regrets that his years of court battles with ex-wife Angelina Jolie have affected his relationships with his children. The former couple — who share Maddox, 22, Pax, 20, Zahara, 19, Shiloh, 18, and twins Knox and Vivienne, 15 — split in 2016 after an allegedly abusive altercation on an international flight. Per legal documents, the Once Upon a Time…in Hollywood star allegedly grabbed and shook Jolie on the plane and told her she was “f—— up this family.” It was also alleged that Pitt “choked” one of their kids and struck another in the face. However, Pitt’s rep firmly denied he…