It depends on the language in the DPOA. I advise you to take the documents to an estate planning attorney so that he or she can review them and advise you as to your rights as Agent. Some POAs can be used immediately upon signing; others cannot be used until a Principal is declared "incapacitated." Explain the situtation to the attorney to find out your options. You may need guardianship or conservatorship.
Previous poster is exactly right. If you are the Attorney in Fact for both of them, sounds as though it may be time to invoke that power to get the situation under control. You are going to need a lawyer to review your facts and help you present this to the Court so the Court can make a decision. Best wishes to you. Elizabeth Powell
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I agree with both previous answers regarding the power of attorney and the specific language of that document. You may also need to consider a guardianship for one or both of them also. I recommend that you speak with a qualified attorney who is familiar with powers of attorney and guardianship law.