Estate Law Questions? Ask an Estate Lawyer.
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First, it is easier to say when a trustee can be replaced, because there are only limited reasons by law for replacement (it would be impossible to say all of the instances when a trustee CANNOT be replaced).
A trustee may be replaced/removed for 1) not performing the duties specified in the trust or law and refuses or is unable to perform them or 2) breach of fiduciary duty to the trust (failure to protect trust property, theft, misuse of trust funds) or 3) not following the terms of the trust and finally, 4) being unable or unwilling to perform any duties required of them by law or by the trust.
So, if your attorney can show breach of fiduciary duty and improper charges and signature forgery, those are grounds to seek to have the trustees removed.