My sister and I share POA for my mom (84) who suffers from dementia and bi-polar disorder. My sister recently tested positive for cocaine at her job. She has a history of alcohol abuse, and in 2015 she was hospitalized for an overdose and was on life support. My mom lives with her. I am worried about my mom being in her care. There has been no abuse or neglect, but my sister is insisting it is her right to continue drinking.