There are clinical means for evaluating a parent for manipulation & personality disorders, but they are time consuming and therefore expensive; and the expense

There are clinical means for evaluating a parent for manipulation & personality disorders, but they are time consuming and therefore expensive; and the expense does not end with the evaluation, the deposition and testimony that inevitably follows is prohibitively expensive; and you can double the cost if your former spouse retains their expert(s). To the extent there is a strategy for legitimately addressing this, its patiently documenting over an extended period time. Logging things like significant decline in social life, significant negative change in grades, significant comments from teachers, significant negative changes in behavior. While documenting this you have to be squeaky clean, refraining from disparaging the other parent and engaging in your behaviors that may muddy the waters. More often than not, one or several of your kids will show signs something isn't right to an extent that a 3rd party (Guardian, the Court, etc) or even your former spouse can't deny it. At that point, for many people, the system gives way to change. For some people justice for the child is never done and the family and society often pays a terrible price in those cases. Can't recommend this book enough if this topic hits close to home for anyone: https://www.audible.com/pd/The-Boy-Crisis-Audiobook https://www.audible.com/pd/The-Boy-Crisis-Audiobook