Read the excellent BBC article Parental alienation: 'I was manipulated by my father' to trace the stories of Emma and Alison. Here is an excerpt:
"Emma", now 14, was seven when her parents divorced. Over the next five years, she says, her father succeeded in turning her and her siblings against their mother. "[He said my mum is] a liar, that everything that's happened is her fault, that she doesn't love us, that she's been a bully towards us," she tells the BBC's Victoria Derbyshire programme. Emma's experience is an example of so-called parental alienation - the deliberate manipulation of a child by one parent against the other parent during a divorce or separation. She says he would deliberately block them from seeing their mother, saying she had "been out drinking the night before and had a hangover, so couldn't be bothered to come [and visit them] any more".
See also some of the video here and here.
For additional background, check out Nick Child's article.
Karen Woodall, from the UK Family Separation Clinic, explains that mandatory therapeutic intervention does not work, and she is right, for reasons also explained here.
Listen also to a BBC radio show on parental alienation
Here is another BBC radio show on parental alienation, this one is 28 minutes.
See also ABC 2020 exposes Parental Alienation , CNN exposes parental alienation , 60 Minutes exposes parental alienation and Canada TV Investigates Parental Alienation , and Newsweek: Parental Alienation Syndrome Isn’t in the DSM Yet, but It’s in Plenty of Arguments ,and New York Times: When Ties to a Parent Are Cut by the Other