Meet the Von Trapp Children. Justin, Amanda, Melanie and Sofia Von Trapp, known as JAMS. They are the great grandchildren of Captain and Maria Von Trapp from the Sound of Music. These Von Trapp Children (JAMS) have performed all over the world including England, South Korea, Australia, Japan, Ireland, Austria, Belgium, and Africa to name a few. They have performed with many major symphonies in the US and Canada and South Korea.