Parental alienation is a term used to describe a process by which one parent tries to cause the child to reject, fear, or avoid contact with the other parent.
Parental alienation cases are often very difficult because (1) it is difficult to prove, (2) it can be difficult to disprove, and (3) even if proven, it is difficult to find a solution that fixes the problem.
Parental alienation describes the process, usually intentional, by which a parent conveys through words, actions, or behaviours to the child that the other parent is dangerous, unsafe, abusive, or “bad,” which results in the child becoming fearful or avoidant of the targeted parent.
Alienation can be very difficult to prove in court, but you should start documenting any changes in the child’s behaviour. You should also speak with people who know the child well, like teachers and ask if they’ve noticed any changes as well, as they can serve as witnesses.