Problem: After a wild first year in college with less than stellar academic results, Sidney made a deal with her grandmother to keep an 11pm curfew and refrain from consuming alcohol and other intoxicating substances for the next academic year. In exchange, Sidney would receive a new car, worth $35,000. Sidney was 21 for the entire academic year covered by the agreement. Unfortunately, Sidney's grandmother passed away after Sidney successfully completed the agreement (finishing the year with notably better grades), but before the car could be purchased. The grandmother's estate does not want to make good on the agreement, and to get Sidney to go away tells Sidney that she would not be successful in a lawsuit to enforce this agreement arguing that because what she agreed to do was good for her, the agreement lacked consideration. Is the estate correct?