A lot has been said and written about Parental Alienation, and debate has been heating up regarding whether parental alienation syndrome belongs in the DSM 5, ie, whether it is a diagnosable mental health condition. Simply speaking, parental alienation is when a child refuses contact/visitation with a parent for unjustified reasons. In dealing with custody cases, one does come into contact with people with various forms of mental health conditions, and I have seen children caught in the middle of nasty divorces. Sometimes the vitriol comes from one parent, and sometimes from both parents. Based on my (non-scientific) observations, parental alienation of ranging severity does occur. It is unfortunately common for parents to share litigation details with their children, discuss the appropriateness of the child support award with their children, etc. On the opposite end of the spectrum, children may begin to internalize the negative comments of one parent and refuse to visit with the non-custodial parent. In my opinion, even very flawed parents should have the opportunity to bond with their children, given appropriate safeguards. Keep in mind, the judge WILL give each parent time with the children, even if your ex feeds the children fast food every night, has a boyfriend with a DUI, and lives an hour away! When you are in the middle of litigation, try to remember that the other parent wants to have a relationship and bond with the children, just as you do.
For a contrary view, see this article on Slate. Dahlia Lithwick argues that parental alienation is mainly a tool used by fathers against mothers. I do believe that can happen as well, but it is a mistake to fail to consider possible parental alienation in custody cases.