Get everything in writing with Attorneys....and clauses for deaths and transfer arrangements. My dad did a few similar deals. He sold 18 acres with an old bar, store and non-working gas station...for $200. a month until his death....(sold) to a good friend of his. His good friend passed away after 12 years...while dad was still alive in assisted care, being dad's guardian at the time...i let his son continue payments on behalf of his deceased father...as it was the right thing to do. There wasn't any written contract...everyone assumed in this case dad was going to die first. lol