If it is their land, my gut instinct is it is like these used car places that insist you make weekly payments, they aren't there the day the payment is due so they can repossess your car and sell it to the next sucker.
This does happen......
In a different life time...worked wit 2 brothers that came from Yugoslavia...old day before the trouble.
Both work in out shop.
They would stay in a room over their Uncle's bar...and help out for free rooms.
Saved all their money....then they bought duplexes......and sold them.....
They financed the buyer...no money down...but had a very large balloon payment in the third year.
Most everyone couldn't make that payment...so they would get it back and sell it again.
Both bought bars ...to kinda hide their money....and also ran an imports business.
Point is....this stuff happens all the time...and is legal.....and as long as you make the payments on time...It will become yours ...just take awhile.
Actually bought my second land parcel at "The Place"....under a land contract....and at the end of the contract received a letter from the seller...telling me I had satisfied the contract...and was done paying.
We had a spread sheet...both of us... and seemed that I still had a year and about $1300 buck left.
So.....what to do?
I had asked to pay it off early...but the guy didn't want me too?
Sooo, called my lawyer and had him take care of the details...Yup was paid...???.....and did get a clear title signed off on...and logged it to the county.
In the back of my mind was 14 years of payments....a loosing out for default on a payment.
Cost me $150 bucks of for well spent money....
I do not like leaving these things to chance.