Who is entitled to administer an estate?
When somebody dies, the administration of their estate is determined by either their will, or if they don’t have a will, inheritance laws. If there is a will, the person(s) named as executor in the will is the person entitled to administer their estate, and they must do so in line with the terms of the will itself.
If there is no will, inheritance laws determine who is entitled to administer the estate (and benefit from the same) and this person(s) becomes the administrator.