Mom and Dad named each other 1st POA's and SIS second. SIS is acting and stealing. I got mom to change her POA but Dad is believing SIS and is not changing POA. (Dad has a touch of dementia.) I have tapped into Dad's IRA and SIS has withdrawn 3 times this year alone and deposited into her own account. Now SIS got my father to say "no more online account to IRA" so I can't monitor her stealing. SIS assumes I was the whistle blower so she told Mom she is fighting "dirty". She lives off my father's Social Security and goes out to dinner several times a week with her husband (alcoholic and gambler) and gives my diabetic dad food pantry food which is mostly sugary snacks. Our parents lawyer questioned SIS and said she could not come up with answers. How can we stop the financial and mental abuse without me draining my funds legally?