A 15 year old takes piano lessons; his teacher says he has talent but his dad says he does not; who's right?

Teacher says student can play stuff like Claire de Lune, Mozart Fantasia in D Minor, Blumenlied, slow movements of Beethoven and Chopin sonatas, but he needs to practice more. Dad just glares at son and told him he has no talent 'cos he's not playing really hard pieces yet. Who to believe? The boy believed dad and quit piano. In fact if he sits down at his beloved piano he feels mostly fear of that awful glare of disapproval..