As a beneficiary of your dad's trust, you have an interest in the trust assets and the proper administration of the trust. If the trustee of your dad's trust has died and your brother is transferring money out of the trust's bank accounts, you may have cause for concern.

The first step you should take is to review the terms of your dad's trust agreement. The trust agreement should outline the procedures for handling the death of a trustee and for appointing a successor trustee. If the trust agreement does not address the issue of the trustee's death, or if your brother was not named as the successor trustee, you may need to take legal action to have a new trustee appointed.

You should also determine whether your brother's actions with respect to the trust's bank accounts are proper and in accordance with the terms of the trust agreement. If you have reason to believe that your brother is acting improperly or mismanaging the trust assets, you may need to take legal action to protect the trust and your own interests as a beneficiary.

It is important to act quickly in these types of situations to minimize the risk of loss or mismanagement of the trust assets. You should consider seeking the advice of a trust and estate attorney to determine your rights and options as a beneficiary and to assist you in taking the necessary steps to protect the trust and your interests.