Sarah Sutcliffe was an orphan and an heiress to a substantial amount of money. Jaspreet, the plaintiff, agreed to act as her guardian during her infancy. In that capacity, he borrowed money to pay for her education. She promised to repay that amount when she reached the age of majority. Sarah later married the defendant, who also promised to repay the plaintiff for the money that he had spent on Sarah's education. However, neither Sarah nor her defendant husband made repayment. The plaintiff then sued the defendant, the husband, on his promise.

Do you think that the defendant husband has an obligation to repay the plaintiff for the money he borrowed to pay for Sarah's education? Would it make a difference if the defendant put his promise under seal? Please explain your answer.