What forms do I need to act for my parents?
You are correct. Use of Durable Powers of Attorney are becoming more common. A Durable Power of Attorney is a document by which a person, while competent, appoints someone else to be able to act on their behalf. However, the guardianship and conservatorship appointments that you have are even better in your circumstance. These are court issued orders that give you the power to act in regard to your mother's financial and health matters. If you encounter a financial institution employee who is not familiar with these, merely ask to speak to a supervisor.