My opinion (but I’m not an attorney.)
An affidavit of heirship is commonly used by landmen when leasing property. An affidavit of heirship is a statement of facts. Who owned the property, when they passed, marital status, children, etc. As far as I know, the only statutes that cover it is Oklahoma §16. 16-67 section C covers the references that make it marketable title.
http://webserver1.lsb.state.ok.us/OK_Statutes/CompleteTitles/os16.rtf
C. In order to establish marketable title pursuant to this section:
1. The affidavit or recital must state that the decedent died without a will, or if the decedent had a will, that the will was never probated in Oklahoma and a copy of the will is attached to the affidavit or recital, or if the will was probated that the severed mineral interest was omitted from the final decree of the decedent and a copy of the will and final decree is attached to the affidavit or recital;
2. The affidavit or recital must list the names of the decedent’s heirs and their relationship to the decedent;
3. The affidavit or recital must state that the maker is related to the decedent or otherwise has personal knowledge of the facts stated therein;
4. The affidavit or the title transaction that contains the recital must have been recorded for at least ten (10) years in the office of the county clerk in the county in which the real property is located; and
5. During the ten-year period following the recording of the affidavit or the title transaction that contains the recital, no instrument inconsistent with the heirship alleged in the affidavit or recital was filed in the office of the county clerk in the county in which the real property is located.
I agree with part of Michael Hutchison’s statement below. “Leasing does not require much proof but the payment of royalties is subject to the opinion of a title attorney.”
However this part I have issues with. “If the mineral acreage is leased now or in the future and drilling commences make sure the Affidavit will be sufficient proof of clear title for the lease operator to pay royalties”
I’m not sure how you can make sure. Many times, the landman trying to lease the property will tell you about anything to get you to sign a lease. A title opinion is usually not completed for months after the well is drilled so getting reassurance that the AoH is ok will be difficult to obtain.
It is not hard to find instances of testimony on this board where they were leased with an AoH and then payment has been held in suspense when a well was drilled.
My advice:
Negotiate and obtain a good lease using the AoH. Take the bonus money and hire an attorney to do a summary probate. Select an attorney knowledgably with both oil and gas experience and estate experience. The cost should be about $3000 for both attorney fees and court costs.
Then make 100% sure that you take measures to pass it on to your heirs and not burden them with the same issue. Place in a trust, create a Transfer on death deed (and make sure they know how to execute it), etc.
I have some samples of some AoH documents that I have picked up from county records if you would like to see them.