If you skip the “commercial” part of the following video, it is quite helpful in understanding Parental Alienation Syndrome (PAS). It is explained by a psychologist Dr. Richard Warshak.
As you can see, even in America there is a problem of PAS and many family courts have problems in dealing with it, but more do not.
I hope you do take some time and watch the video. This video should also help these children who were damaged by being alienated from one of the parents.
Also, in the following video dr. Warshak talks about parental abductions by parents who use children as a weapon.
I hope you take the time to watch both videos. I may help you in preventing some of the situations.