Final answer:
Johnson may be liable for a breach of contract depending on the terms of the offer and their actions. More information is needed to make a definitive determination.
Step-by-step explanation:
Johnson may be liable for a breach of contract in this situation. In order for a contract to be valid, there must be an offer, acceptance, consideration, and intent to create legal relations. Here, Tjon Cady received an offer to purchase the house from Reta May Johnson, represented by her son Jared Johnson. If Tjon Cady accepted this offer, then a contract may have been formed between Tjon Cady and Johnson.
However, the details provided in the question are not sufficient to determine whether Johnson actually breached the contract. It would depend on the terms of the offer and whether Johnson failed to fulfill any obligations stated in the offer. Breach of contract occurs when one party fails to perform their obligations under the contract without a valid excuse.
To make a definitive determination, more information about the terms of the offer, any conditions or deadlines, and the actions of both parties would be needed.