Is there an exapmple that I could refer to regarding to

Can I get assistance with this question for an assignment. Any examples would be of great help- see below the task and the question:

Soon after his 75th birthday, Stanley Somber (SS) retired from his position as a tenured university professor. He was having difficulty recalling the names of his students and found that he continually needed to remind himself of material, which in some cases he had taught for over 45 years.

SS decided to dispose of many of his worldly goods so he could raise enough money to pay for his retirement property. He was delighted when a prospective purchaser for his beloved Holden Monaro introduced himself as Horace, a favourite student of SS from a class in the '90s. They reminisced with the aid of a student yearbook that Horace had brought with him. Looking through it, SS suddenly decided to take $5,000 off the asking price, just for Horace. SS signed the transfer documents.

After hearing about SS's plans to move, Horace recommended that he contact one of his friends, Snakey Deslipp (SD), who owned the Sunny Acres Retirement Home.

The following day SS met with SD, who was persuasive with facts and figures. It was very confusing. SS had made it clear from the outset that he was only starting out on a fact-finding mission, but by the time they parted, SS had signed a document under which he had not only purchased an apartment at Sunny Acres, but also agreed to pay monthly rent.

Subsequently, the cheque given to SS by Horace for the car was dishonoured. It transpired that the purchaser was not Horace but Cecil, another former student from the same '90s class, who resented SS for having failed his essays and exams. By then, Cecil had sold the Monaro to a first-year law student for $50.

Task:

Advise SS as to whether there are any vitiating circumstances that may exist in his dealings with Cecil and SD. If so, what are his remedies? (In your answer you may ignore any specialised legislation regarding retirement homes, or legislation regarding cooling off periods. You may also assume that the contracts are enforceable, other than vitiating circumstances that may be present).