Yes, but you'll need to bring the power of attorney form and proof of who you are to the bank. If the teller doesn't know what a power of attorney is then all you have to do is get the manager. They always deal with power of attorney agents, and know what the form gives you authority to do, which is act on the behalf of the executor in all financial matters, except matters specifically stated in the form that the agent can't handle.
Your nephew's nephew is the son of one of your nephew's brothers or sisters. He is your great nephew.
Power of attorney expires on the death of the individual that granted it. If she had a will, it needs to be probated and the court needs to appoint an executor in charge of the estate. Consult a probate attorney in your area.
Your mother's (mom) nephew is your answer.
Your nephew's son is your grand nephew or great nephew.
Your nephew's son is your great nephew. Your niece's son is also your great nephew.
Your wife's nephew is your nephew and his son is your wife's, and your, great nephew.
The male counterpart of a niece is a nephew.
If mother's will gave her real property to her son and gave her nephew the right to live in the property then her nephew has a life estate. Her son must follow the provisions in the will. You should consult with the attorney who handled the estate to determine what your rights and obligations are.
Niece would be an opposite as a niece is female and a nephew is male.
Your nephew's son is your great nephew.
Your nephew's son is your great nephew.
In English language terms for family relationships, there is no relationship called "nephew once removed." The son of your nephew is your great nephew.