According to June 6, 2018 court papers in the Angelina Jolie/ Brad Pitt custody battle it appears that the children are being closed down to a relationship to their father. This can be considered parental alienation.
The June 6th Court papers obtained by People Magazine states:
"The children not having a relationship with their father is harmful to them and that Jolie could be in danger of losing full custody if the minor children remain closed down to their father."
I would categorize this divorce as a high-conflict divorce and the custody battle seems to be heating up.
I have seen in my custody cases that many times one of the parents will not promote and at worse still discourage the children from seeing the other parent. This is called parental alienation and is quite common especially in bitter custody battles.