Estate Law Questions? Ask an Estate Lawyer.
You are very welcome. Just remember, that the children, through you as their guardians, have the legal right to all information about any trust or trust account that they are a beneficiary of, including account numbers. And the trustee has to provide that information at least once a year, and normally within a reasonable time after a written request for info..
I would make it a practice of formally requesting info about the account(s) because as I said, it raises some red flags for me that the trustee is threatening legal action when asked for information about the accounts..