A power of attorney terminates at death. They will have to open a probate to take any action. Do you know if there is a will, or if your fiance is an heir to his aunt?
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You should consult an attorney experienced in probate law about your situation. However, the maintenance man and the lady with the power of attorney have no authority to evict you. As Attorney Chen said, a power of attorney terminates at death. To take any action concerning the property, a personal representative will have to be appointed by the probate court. What eventually becomes of the property will depend on whether or not the aunt had a will or not. If she did not have a will, it will depend on which relatives survived the aunt. In any event, the oral agreement you and your husband had will his aunt will have no bearing on the final disposition of the property.
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As the other two answers stated, the answer to this question will depend on the disposition of your aunt's estate in probate. Do you know if a personal representative has been appointed for the estate? If so, you should talk to the representative about where and to whom rent payments should be made. Even if you do not know who to contact regarding payment of rent, you should put the money you would have been paying in rent aside so that it will be available when you figure out where the payments should go.
This answer is for informational purposes only. It does not constitute legal advice and does not create an attorney-client relationship. There may be relevant facts not included in the question that could change this answer. For specific advice, please consult with a licensed attorney in your jurisdiction.
They can't evict you with just a Power of Attorney. The POA is void now that the grantor is deceased. If the aunt left a will, it should name an executor of her estate. If she died without a last will and testament, then the family members should get together and hire an attorney for probate.