Dr. Richard Garner coined the phrase Parent Alienation Syndrome back in the late 70s and it has been a controversial contruct ever sense. As they say, "Seeing is believing" and over the years I have been involved with families where parent alienation syndome is present and in my experience this is a very real thing which is often misunderstood and made worse by our Child Protective System, our Family court system, and our school systems.
The podcast lasts about 50 minutes and can be listened to on line or downloaded. I highly recommend it if you are interested in this topic. You can access it by clicking on the link below.