我们怀疑妹妹在滥用POA。我们能做什么?

她是第一个出生的孩子，总是试图控制我们的家庭。她不会和她的5个兄弟姐妹分享医疗/经济信息。她是个恶霸，如果你问任何问题，她都会阻止你。她总是撒谎。她不让我的家人进入银行账户，也不让他们使用她经常更改的账户密码。我们已经召开了三次家庭会议。她很不讲理，挂断电话，然后谩骂每个人。我们知道我们的父母没有设立POA她告诉他们要做什么。她于2020年4月成为POA，但自2017年以来一直为他们支付账单。这么多危险信号。 We've talked to our parents and said they have to revoke her poa. They are scared of their daughter because of her reaction. No one in our family knows anything about her or her family but she knows all about us. She is a narcissist and very toxic part of our family. My other siblings are finally seeing her evil BUT she will manipulate and put her "hook" in one person she can bully! She recruits people and lies to them to get on her side. She's taken things out my folks house without asking. Jewlery, 2k check to my mom from her brother. Says she is going to pay property taxes with it. None of us siblings can afford an attorney. She has broken the family and causes so much drama, chaos and bs! We NEED to get the bank statement. My folks were willing but now they keep putting it off. We've met and told them everything we are suspecting. They don't want to believe it but yet know everything we are saying is true about her and how she treats everyone. My mom won't call the attorney to even ask questions. Both my parents have resent memory loss. She's trying to strip them of everything. Moving them against their will. Taking them to tour assisted living. Deposits on places. She now trying to take my dad driver license away and being sneaky. Already took my mom's away few years ago. What can we do as a family? Who can we talk to, ask questions? Is there any way we can get their bank statement? I tried online I have all my moms info, security questions and then when they send you a code it goes to her phone or email!
我刚刚加入，所以我还没有浏览论坛。这是我的第一个帖子。
如有任何建议，我们将不胜感激。