Power of Attorney

My daughter obtained a Durble Power of Attorney for my husband (her father) in May 2010, after he had been diagnosed with Alzheimers Dementia in June 2009. He's been on medication and under medical care since that time with progressive deterioration of mental capability. She was fully aware of his diagnosis, treatment and decreasing mental abilities. I, his wife, have been his contintuing caretaker. She has used her status of Power of Attorney to take over ALL of his life decisions (medical and financial), including the taking of ALL his money and putting it in an account, the whereabouts I do not know and has refused me knowledge of where it is nor do I have access to it. All this was done with my husband's consent but I'm not sure he recognizes the significance of these events now or then. I'm just beginning to explore my rights as the situation has become citical and the family is in chaos.What recourse do I have?

Does a full durable POA over all finances and trusts, give theagent named in the POA full control over all bank accounts, eventhose in the name of living trust?

Does a General Power of attorney have to be notorized in Washington state?

Is the Power of Attorney liable for services to the principal when another person -A family member of the principal -signed for those services without the Power of Attorney's knowledge and/or approval?

My son is in prison and has given me his POA. Do I sign his name and am I as his POA legally responsible for any of the documents and/or contents he has me sign in front of a notary? Thanks