Wow. Id be p*ssed if i was the renter here. Rent property for agricultural purposes just for some entitled nitwits to takeaway your income. Even if just a verbal agreement, things would change pretty quickly. Best case scenario would probably get out as soon as able.
Side note, that absolute idiot daughter sounds like the stereotypical idiot city dwelling "animal owner." Mowed to see what was there? Well, she jus mowed 4-5 acres of good grazing for her horses that she probably starves to begin with.