My mother is the power of attorney over my grandmother's house who is deceased. The house itself was left to me and 3 other close family members, but not siblings leaving my mother as POA. I've been here living just me and my fiance and she wants to kick us out for irrational reasons on her behalf. Is she able to because she was appointed POA or does the will have any power in this type of situation ?
At that point the executive of the estate calls the shots. If your mom is also the executor, then yes, she can ask you to move.
Did your grandmother leave the house to you and others in a will or was this something she told you verbally?
As 97yroldmom had mentioned above, your Mother no longer has Power of Attorney. That died when your Grandmother had died. Who is the Executive of the Estate? That would be mentioned in Grandmother's Will, if she had one.
If there was no Will, then it is up to the Probate Judge to decide who gets what. Usually it is the immediate heirs, such as Grandmother's children who would get the house and the rest of the estate.
Sounds like the estate hasn't been closed by the Probate Judge. Or if no Will, any decision has been made. Thus, everything is in limbo. Did you move in before the Will was read, or before Probate was closed?