For some reason, your question was duplicated. Please refer to my other answer. I think you have a mess and may need an attorney to straighten this out.
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Your question has far too many missing facts. land have house or vacant? if house, occupied? why did so much time go by?
Main problem will be statute of frauds if there is no written agreement for the sale of land. Even if you have a writing the statute of limitations is 6 years from the date of the breach. You're probably out of luck so be nice to your dad and he'll soften up. or not.
The above answer is generalized reply to an question and is not intended to be legal advice or establish an attorney-client relationship with you. If necessary you should meet with an attorney and provide the attorney with all relevant documents and get an attorney opinion or advice on your situation.
A most excellent attorney right there on Chicago St. in Jonesville. I suggest you make an appointment with her for a brief consult. Bring any paperwork, if you have it.
We do not have a client/attorney relationship until you make an appointment, we discuss your case face to face, I accept a retainer, and we explictly agree to enter into representation.