It's established in Act 1 of the movie, that he has a practice board and that his mother taught him the piano.??? Every time they move, they assume a new identities and blend into the local community.? The protagonist and his brother attend public schools. (The movie is set in the 80's when homeschooling was not a popular option.? In fact, at that time, it was still wasn't legal in most states.)
The fictional world of the movie, that? his parents were militant activists in the 60's resonated with the zeitgeist of the 80's, when militant activists of the 60's were mellowing out as they entered middle age, had families, bought property;? they wanted to live normal lives.? But there were still some --like the protagonist's parents-- who were still true believers in their radical ideas and who had to hide out because of lawless deeds for which they could still be arrested and go to prison.