Why was Tommy sands blackballed by Frank Sinatra?

Tommy Sands was reportedly blackballed by Frank Sinatra due to a romantic relationship with Nancy Sinatra, Frank's daughter. Sinatra disapproved of the relationship and took steps to undermine Sands' career in the entertainment industry. This tension reportedly led to Sands facing challenges in securing roles and opportunities during that time. Ultimately, the fallout reflected Sinatra's protective nature as a father and his influence in the industry.