You're going to need to hire an attorney AND a psychological professional who can talk to the children and be willing to testify that your ex has engaged in "parental alienation."
Some professionals believe that "parental alienation syndrome" is just a buzzword. Some judges think the same way.
Often children (even "good kids") will play the parents against each other. It's almost irresistible when the child becomes the center of attention for the first time in his life.
