Quote from @Jordan Akins:
Well it does sound like your dad needs help (from the comments you've made here). I wish it were in SE TN.
The cow can't continue to give milk if you don't feed it. Regardless, you're taking a step in the right direction. That is finding someone or a solution to this destructive path.
Now please don't take the next thing I'm going to say the wrong way, but someone needs to take over or he needs to sell. The reason I say this is because he had a good property that is getting worse each day, that means he is not doing the right thing. At minimum, a property should be maintained in same quality/condition as purchased.
Selling is the worse option, but if necessary then...
Can you or a close friend or relative take over? Or find someone who is ambitious (generally younger person with no money or property, but they have drive and ambition), offer them a percentage of ownership and profit sharing once property income goes above a certain amount. Pick wisely, that person could be your future partner, that person could bring your father and you future wealth.
Or figure out some way that makes sense to bring property back to the level is should be. Feel free to message me with any specific questions. Good luck.