Coque -
Your mentioning that your mother is 86 years of age brought to mind something I think you should all be aware of and be prepared to address.
When I was just starting as a Landman, some 30+ years ago, I leased a man's land in North Louisiana for something like $40,000.00 (I remember the approximate amount, because it was my first big lease and I was very proud of it).
I called his son about another piece of land a just a few months later and he had quite a story to tell me:
The father had been up in his years and, as it turned out, had been totally dependent upon Medicare to pay all of his medical bills for some advanced heart condition. But when he received his $40,000.00 in "income" he was immediately disqualified from further coverage.
The son said that as expensive as his medical care was, the $40,000.00 lasted "a couple of months" and then the father was essentially broke again.
Now, get this part because it's important: When the father went back to the Medicare people, they told him that, yes, he again qualified financially... But that his heart condition was then a "pre-existing condition" - making him ineligible for any additional coverage.
Without proper medical care, the father passed away just a few weeks before I had recontacted his son.
I have negotiated many leases since that time, but have never forgotten the nightmarish sequence of events that had been set in motion by the simple signing of a lease.
And, since that time, I have always inquired as to whether anyone involved in the signing of a lease was dependent upon Medicare or any other "coverages" for medical, disability or even life's ordinary expenses.
And, if they were, to suggest to them that they add a clause to the lease directing all Bonus, Rental and Royalty payments be directed to a son or daughter or other primary caregiver still in their working (taxable) years - thus avoiding any disqualifying surge in that individual's income.
Hope this helps -
Charles
Charles Emery Tooke III
Certified Professional Landman
Fort Worth, texas