Dad recently died and stepmothers DPOA states that upon his death my stepsister and myself are then her appointed coattorney in fact and coexecutors. My stepmother is 90 and unable to care for herself or make competent financial decisions. My stepsister is isolating her and refusing to work jointly with me on making sure she is protected. They immediately closed bank accounts and credit cards that he had set up to receive his retirement and social security from and to pay bills (including her supplemental medicare). My sister also is coagent on her Advanced Medical Directive and is being blocked by my stepsister on being involved in her healthcare. She has fallen 3 times and been sick with UTI to which my stepsister neglected to seek medical attention for.