How can I stop my mom from getting another ATM card. My sister has convinced her to get one. I think this is a way my sister will be able to access my mom's checking. I feel this is true because 8 months ago when my sister was POA, she had an ATM on my mom's account. I found out she was taking anywhere from 1500 to 2500 per month from my mom's checking. My mom, 87, early dementia, does not even know how to use one. I have DPOA and I'm on her bank accounts. Help.