Problem: Grandpa gets his favorite grandson to mow his lawn, clean the house, cook his meals, clear the snow and drive him around for errands. Grandson does this work diligently for 15 years. Grandpa promises the grandson that he will leave the house to the grandson when grandpa dies. Grandpa makes this promise in front of multiple witnesses. He even posts his promise on Youtube for the world to see and hear. However, at the age of 93, grandpa marries 21 year old Golda Goldigger. Two months later he drops dead, having left everything to Golda. Grandson sues the estate for breach of contract. Will he be successful in proving breach of contract? Why or why not? Please be specific.