Jolie filed for divorce on September 19 citing irreconcilable differences and said the decision has been taken for the "health of the family".
The 52-year-old actor had a "wonderful" time with his kids, reported People magazine.
"Brad has spent some wonderful time with children recently," a source said.
The LA Department of Children and Family Services has maintained an open investigation following allegations that Pitt was verbally abusive and got physical with the couple's eldest son, Maddox, during a fight on the family's private plane.
Jolie, 41, requested sole physical custody of their six children in her divorce filing with visitation for Pitt, while the actor wants shared custody.