He writes the checks to pay for her bills because she has early stages of dementia. I have financial POA. My uncle is slowing down himself. Can I also write checks on their joint account on her behalf even if only their names are on the checks? I can sign my name on the signature line followed by POA.
I bet Mom's brother will be relieved that he doesn't need to bother with his sister's bills. By the way, who is your Uncle's Power of Attorney? Whomever it is, time for him/her to step up and help the Uncle with writing checks for his bills.