opic: Business Law

After witnessing a 3-year-old falling into the water, a swimmer jumped into the water and saved the child. The kid's father appreciated the swimmer's behavior and promised the swimmer to pay the tuition fee of the piano lesson that the swimmer told the kid's father he plans to enroll in the next semester. After the swimmer enrolled in the piano lesson, the kid's father refused to pay the tuition fee. Can the swimmer require the kid's father to pay based on an enforceable contract? if there is not an enforceable contract in this case, what are the other theories that the simmer may use to claim against the kid's father?