If there is a dangerous situation at the house, report it to the city. I do not know enough about your area to give you the name of the department. They do investigate things like the safety of electric service to the house.
Read this if you already have not:
https://www.ssa.gov/payee/faqbene.htm
You should ask for an accounting. If the others for whom your mother is the payee and they all are unhappy and adults, you all should ask as a group by submitting individual information in the same envelope. If others are also being neglected, point this out to APS.