My mom was diagnosed with Alzheimer's about 7 years ago. My father was alive and was a major caregiver until he died in 2010. There are 9 siblings, but 1 sister had herself appointed POA for my mother. She is also her health care agent. My one other sister and I have my mom's legally signed permission to view her medical records. When my father passed away, my mom went to live with the youngest sibling in the family. The POA was not in place at this time. About 6 months after Mom was in the wonderful environment, my sister, who is now POA, decided to create problems. Against the advice of all of the siblings and my mom's doctor, my sister now has my mother living with her. There have been many battles about our seeing our mother. Now, due to the stress my sister says is unbearable, she is blaming the rest of us for having had a mini-stroke and to spite us, said she will be putting our mother in a nursing home ASAP. She has since denied us contact with our mother. She threatens us with going to court, etc. and she, her daughter and husband shout at my mom. She also lies about our mother's health, sold much of my father's, now my mother's, property and has locked us out of our mom's home. She screams at us when we try to talk to her and WILL NOT LISTEN. We want to see our mother. How do we get past our sister?

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State/Country relating to question: Wisconsin

Already Tried:
We have tried talking with her, talked with human resources, attorneys, my mom's doctor, helping out with whatever we can, even letting her dictate to us because we want what is best for our mother. She tells us that she is going broke with Mom living with her and when we ask to see written records so we can judge what financial help we can continue to offer, (We take care of a lot now), she screams at us and says she doesn't have to show us anything unless we want to "GO TO COURT"!