If one parent is alienating the child from the other pareint, that could be a basis for modification if it can be proved. The problem is you can't use the child's statements in court because child hearsay is inadmissible. The only way to get that evidence before the court is through a Guardian ad Litem or the child's therapist who woudl be willing to testfy -- not easy to accomplish at all.
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You may need to file a petition for a major modification of the parenting plan, which might include a requirement for reunification counseling if the parental alienation is severe. The custodial parent may also be in contempt of court. It’s always best to consult with a good family law attorney to discuss the details before you act. See my AVVO Legal Guides on child custody, major modifications, and contempt for more information about the legal issues raised by your inquiry. Click on my photo. On my AVVO home page click on "View Contributions" or scroll down further and click on "Legal Guides." Scroll down the list of my 29 Legal Guides and select the topics relevant to your question. If you like my answer and Legal Guides, please make sure you mark them as “helpful.”
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