Frank Sinatra, Jr. net worth: Frank Sinatra, Jr. was an American singer/songwriter and composer who had a net value of $50 million. His dad had a legendary star. Frank Sinatra, Jr. developed an interest in music from a young age and started playing the piano as a kid. He started his very own performance when he had been in his late teens, and began travelling with the Sam Donohue Band. After performing throughout the world for several decades, he turned into the vital conductor and arranger for his dad’s performances throughout Sinatra’s life. He’s released seven albums and played on many different TV shows. His music was featured in several movies, too. He was kidnapped at age 19, also returned to his family following his father paid a considerable ransom. Regrettably, Frank Sinatra, Jr. died on March 16, 2016, in age 72 of coronary arrest.