I agree with Lisa... unless you are the power of attorney then there will be a lot that any of the family members can do just as you can do.
if you are on the list of whom can open the saftey box then you can do that.
My mom has already had me added to her checking account, everything is on my name, and I am power of attorney, and the excetor of her will. she has also made a living will, as to take that off of me..
I am sorry you will be going through this. maybe all of you can pull together and do what is best for your mom.