David Heyward had seven (7) sons and four (4) daughters. He owned a 100-acre ranch in Arizona. He was born in what is now Slovakia, and cannot read or write English. All of his children had frequent contract with David and helped with his needs, especially after the death of his wife Amanda. However, his eldest son, George, advised his siblings that he would henceforth manage his father's business affairs. After much urging by George, David deeded the ranch to George for $12,750. Evidence showed that at the time of the sale, the reasonable fair market value of the ranch was between $420,000 and $509,000.
At the time of the conveyance, David was 93 years old, had deteriorated in health, suffered from heart problems and diabetes, had high and uncontrollable blood sugar levels, weighed approximately 329 pounds, had difficulty breathing, could not walk more than 12 feet, and had to have a special apparatus lift him out of the bathtub. He was for all purposes an invalid, relying on George for most of his personal needs, transportation, banking, and other business matters. After David died, the conservators of the estate brought an action to cancel the deed transferring the farm to George.
Can the conservators cancel the deed? What cause of action do you recommend in this case?