I have all powers in a durable POA for my mother. She has the beginning stages of dementia. Recently my sister, her daughter and husband moved in with her. I have two questions. Can my sister sell my mom's house without my consent? Can my sister's son-in-law sell my mother's car?
We have an article written on Durable POA that should help answer what does it mean when one has durable POA.
A durable power of attorney (POA) enables your elderly parent (called the "principal" in the power of attorney document) to appoint an "agent," such as a trusted relative or friend, to handle specific legal and financial responsibilities. Families should prepare this legal document long before someone starts having trouble handling certain aspects of life. (read more...)
https://www.agingcare.com/articles/what-is-durable-power-of-attorney-140233.htm
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Many Durable POAs go into effect immediately after being signed and thus do not require a doctor to declare your mother of not being competent to handle her own business in a business like manner. I think you need to check and see if your durable POA is one that is already active for you to use now!
Why did your sister and her family move in with your mother? Are they planning on taking care of her? Why after moving in with her do they want to sell the house (to get the money and leave mom with you?)?