Skinsman, with two Power of Attorneys there are two ways this is done. One is that you are the main Power of Attorney and when you no longer can or don't want to continue as Power of Attorney then your sister takes over...... Second is that both you and your sister are equal as Power of Attorney. Which way is it?
It is best to work as a team for your Grandmother's best interest. I see from your profile that Grandmother is 91 and has Alzheimer's/Dementia and age related issues. The care should be joint sharing of chores if you live close enough. This is not a job just for one person alone.
I don't understand what you mean by "power of attorney address is with my residents". Is your sister a co-agent as power of attorney, with equal rights? Is the medical POA? Financial? Who has been keeping the records for bill paying, and etc.? Where is Grandma located now? Where has she been living? Have you and your sister both been acting as power of attorney for Grandma? For how long? What is Grandma's condition currently? Are you and Sister working together or fighting together? Need MUCH more information here as haven't a clue as to what is happening in this situation.
It is best to work as a team for your Grandmother's best interest. I see from your profile that Grandmother is 91 and has Alzheimer's/Dementia and age related issues. The care should be joint sharing of chores if you live close enough. This is not a job just for one person alone.