Can a seller renege on a contracted house sale?

Question Details: My brother squatted in my home for many years. I allowed it because I felt bad for him. Now he's back on his feet, destroyed my home and wants to buy it at the price it's worth less the amount it will cost to fix what he's done to it. He and his new wife have threatened me. They borrowed money from our dad for tearing down trees and repairs and did such repairs and said, "You owe dad $17,000". He undercut the worth with his agent ex-father-in-law. I am now selling at a loss and owe dad. Can I get out of this sale?

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