My Dad granted my sister POA before his passing over a year ago after I refused his request for me to have POA for both of my parents. At the time, I completely trusted my sister. My Mom suffers from dementia, anxiety, and other mental issues. Can I challenge for financial POA for my mom even though my sister currently has POA now. My Mom wasn't competent then or now when my sister received POA from my father. We both have POA on medical matters. I am worried my sister isn't handling my mom's finances well as she will not provide me with any information when I ask or inquire about her money. I have asked her repeadily to be included in any emails concerning my mother's finances. I have asked her to call numerous times and she refuses to discuss matters. Please advise....thanks!