By taking on the role of trustee, you assume a fiduciary duty to the beneficiaries of the trust. This means that you have a legal obligation to follow the grantor’s instructions, whether the grantor is still alive, and to act in the best interests of the beneficiaries. The best trust documents contain dispute resolution procedures to be followed if the beneficiaries allege a breach of fiduciary duty by the trustee. No matter how airtight or how ambiguous the trust document is, you should hire a lawyer to help you resolve disputes related to trust administration.