According to court documents obtained by People magazine, Angelina Jolie could be in danger of losing primary custody of the children if she doesn’t take steps to improve their relationship with their father, Brad Pitt.

“It is critical that each of [the six] children have a healthy and strong relationship with their father and mother,” a judge said in the couple’s ongoing divorce case. That means she must allow the kids to see Brad to maintain the relationship.

People interviewed family law attorney David Glass, who is not associated with the case, who says it “is extremely rare” to see a court intervene in this way.

“It looks like what this judge was weighing was the difference between estrangement and alienation,” said David, who has not had access to the court documents. “The difference there is, estrangement is when children aren’t connected to one of the parents, mainly because of something that parent did. So a hypothetical, if dad screams and yells at the kids and doesn’t treat them nicely, the kids stop wanting to see dad, that’s estrangement. An alienation refers to where children have been told by the other parent that the parent they’re not seeing is bad, or doesn’t like them, or doesn’t care about them. Just talking badly about the other parent and the kids start to internalize what the other parent is telling them. In alienation cases, kids will typically just repeat words that are beyond their years, or they will repeat reasons that they don’t possibly have access to the information.”

Read more at People.