Just found out my sister is taking my mom's money from her checking accounts and putting it into another savings account that my mom has no access to. She claims she is POA but I don't know if this is true. Is this legal? If my mother should pass away is that money considered part of her estate since her name is non on that account? What should I do if anything? We are getting POA changed this week. Will all those funds need to be returned to mom and new POA?