They would present their letter of authority to the issuing entity, along with the checks. That should allow the fund to be returned to the estate.
You need to be appointed Administrator of the estate.
An heir cannot cash checks made out to the deceased. The executor of the estate has the ability to cash checks. If the estate has been closed out, it may have to be reopened in order to properly deal with such items.
They follow the instructions of the deceased has laid out in their will.
The executor of the estate.
Certainly. Anyone can be named an executor of an estate, whether related to the deceased or not.
The executor now controlling the estate has to do the transfer but if they had an executor, there is probably also a will, attorney, and a beneficiary (ies)
The executor of the estate is able to sell assets of the estate.
If there is a will, the executor makes all mortgage payments from the estate of the deceased.
The executor of the estate files the tax return for the deceased.
The court will look at the Will to determine if an alternate executor is named. If not, then the state probably has a list of people, in order, who should be named as administrator of the estate. Relationship to the deceased executor is irrelevant.
The executor has the ability to sell real property in the estate. The probate court will have to approve the sale.
If your grandmother is still living, you can't. If she is deceased, the executor of the will is required to notify you if you are in the will. If there is no will, and your parents are deceased, then you should contact the probate court and/or executor.