All contracts, whether oral, written or tacit, have certain elements that can be considered valid. To win the case, the aunt must prove that her nephew borrowed the money with the intention of repaying it, while the nephew must prove that he did not accept such a thing. Without documentation of the agreement, it becomes a matter of he-said-she-said. Ultimately, it is a judge who decides which case the party is most likely. The application of an oral contract often leads to situations that are difficult to validate without proper proof. Due to what can become a battle between the two parties, it is recommended to consult a contractual lawyer and have a written contract drawn up. Typical REALTORS® contracts include contracts with customers as well as sales or leasing contracts. All this must be done in writing.