Frank Sinatra, Jr. net worth: Frank Sinatra, Jr. is an American singer/songwriter and composer with an estimated net worth of $50 million dollars. Born in Jersey City, New Jersey, Frank Sinatra, Jr., is the son of legendary entertainer, Frank Sinatra. His father had an extensive performing schedule and was rarely at home. Frank Sinatra, Jr. expressed an interest in music at an early age, and began playing piano as a child. He launched his own performance career when he was in his late teens, and began touring with the Sam Donohue Band. After performing all over the world for many years, he became the primary conductor and arranger for all of his father's performances through the end of the elder Sinatra's life. He has released seven albums, and performed on a variety of television shows. His music has been featured in multiple films, as well. He was kidnapped at age 19, and returned to his family after his father paid a large ransom.