Did your "no support" position appear in a written agreement or on the record in court? Did the grandmother agree?
The agreement was oral. You can defend with your testimony about it. Count on the grandmother denying the conversation entirely. It is frankly an uphill fight for you since it is not in the decree. You would have to have the greater credibility and still, the judge will probably rely on the letter of the decree. He/she will however, decide the application on its own merits.
This is information only, NOT legal advice. No attorney-client relationship has been created. Consult an attorney in your state for legal advice regarding your issue.
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