http://michie.lexisnexis.com/mississippi/lpext.dll?f=templates&fn=main-h.htm&cp=Click the folder and scroll down to "Title 91 Trusts and Estates"
Chapter 7 is "Executors & Administrators"
Thats the Legalese, Boss.
As to whether or not a relative (Your Nephew) or a disinterested 3rd party should serve as executor is really a matter for you and your wife to decide. It is apparent that the larger the estate, the more sense it makes for a 3rd party to administer the will primarily because ...well...greed makes people act in a strange way, sometimes. Also, it is sometimes the case that what needs to be taken care of by an executor can be quite simply overwhelming, particularly in a time of grief - like right after the both of you pass away. This is another reason having a disinterested 3rd party might be more appropriate.
An example of the duties of the executor, according to Mississippi law (According to the above linked website, anyway) is as follows;
§ 91-7-47. Rights and duties of executor or administrator with will annexed.
(1) Every executor or administrator with the will annexed, who has qualified, shall have the right to the possession of all the personal estate of the deceased, unless otherwise directed in the will; and he shall take all proper steps to acquire possession of any part thereof that may be withheld from him, and shall manage the same for the best interest of those concerned, consistently with the will, and according to law. He shall have the proper appraisements made, return true and complete inventories except as otherwise provided by law, shall collect all debts due the estate as speedily as may be, pay all debts that may be due from it which are properly probated and registered, so far as the means in his hands will allow, shall settle his accounts as often as the law may require, pay all the legacies and bequests as far as the estate may be sufficient, and shall well and truly execute the will if the law permit. He shall also have a right to the possession of the real estate so far as may be necessary to execute the will, and may have proper remedy therefor.
(2) In addition to the rights and duties contained in this section, he shall also have those rights, powers and remedies as set forth in Section 91-9-9. The provisions of this subsection shall stand repealed from and after July 1, 2008.
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Bold emphasis mine)
If you both have wills and they have been updated and generally agree, perhaps a Trust would be the way to go. You would need to discuss this with an attorney to be sure you have the proper answers relevant to your situation.
There are a lot of questions you have to discuss with your wife for your estate planning to really be complete, such as;
1) Do you have a Trust?
2) Is one even needed in your state?
3) Even if it isn't needed, would it be helpful?
4) How are your assets currently titled?
5) Is there significant value in your estate in items with a limited market or of subjective value? (Art and antiques, for instance)
6) Is there significant value in marketable securities or cash or in the value of the estate as a whole in which a heavy tax liability may be owed?
(If the answer to #6 is "yes", are there any life insurance policies in force?)
7) Are you charitably inclined? If so, is the method in which any charities are to receive distributions clearly spelled out?
8) If there is a large sum to go to charity, would a Charitable Remainder Trust be appropriate?
etc, etc, etc.
One thing stood out when i was looking through those MS statutes. Section 91-7-19 says;
§ 91-7-19. All interested may be made parties.
Any proponent of a will for probate may, in the first instance, make all interested persons parties to his application to probate the will, and in such case all who are made parties shall be concluded by the probate of the will. At the request of either party to such proceeding, an issue shall be made up and tried by a jury as to whether or not the writing propounded be the will of the alleged testator.
I am by no means a Lawyer, but it seems to me this provision leaves the door wide open for anyone who can claim to be an "interested person" to come forward and contest the will. A Trust might just remove that possibility.
See an Attorney, Boss!
Hope that helps.