If you're in or involved in Parental Alienation in any way (and the odds are if you're here, then you probably are), especially if you are the child, it may interest you to look up something I've discovered called COVERT INCEST.
It's not your "usual" form of incest, involving the crime of physical sexual abuse (for which perpetrators should be hung by their parts and caned), but more an emotional sexual abuse of children (with perhaps some "lesser" sexual abuse - though I'm not trying to diminish sexual abuse. It is ALL hideous, I'm just trying to clarify the difference between the worst kind and the least worst kind). Mainly it involves focussing on children as sexual objects and also as replacement spouses/confidants. Sound familiar?
Now, don't go applying everything in your situation to Covert Incest. It's not a catch-all definition or new syndrome you can blame for everything. It's not Yuppie Flu. I just found it interesting that so many of the characteristics of the perpetrators of Covert Incest coincide with those of the Alienator.