The State of Rhode Island Department of Human Services lists its Division of Elderly Affairs as the agency responsible for handling any cases involving the potential elder abuse. Complaints can be made to them in strict confidentiality, without the fear of your loved one suffering any reprisals as a result of your coming forward with your suspicions.
While the above information is not meant to be taken as legal advice, it could help to save your loved one and others from continuing to suffer humiliating and degrading treatment from abusive caretakers.