If all assets have been transferred to the trust, you will be able to step in as trustee and manage the grantor's financial affairs quickly and easily, with no court interference.
First, make sure the grantor is receiving quality care in a supportive environment. Give copies of health care documents (medical power of attorney, living will, etc.) to the physician. If someone has been appointed to make health care decisions, make sure he or she has been notified. Offer to help notify the grantor's employer, friends and relatives.
Next, find and review the trust document. (Hopefully, you already know where it is.) Notify any co-trustees as soon as possible. Also, notify the attorney who prepared the trust document; he or she can be very helpful if you have questions. You may want to meet with the attorney to review the trust and your responsibilities. The attorney can also prepare a certificate of trust, a shortened version of the trust that also proves you have legal authority to act.
You will want to become familiar with the grantor's insurance (medical and long term care, if any) and understand the benefits and limitations. Assuming the insurance will cover a certain procedure or facility could be a costly mistake.
Have the doctor(s) document the incapacity as required in the trust document. Banks and others may ask to see this and a certificate of trust before they let you transact business.