Prof Vasant Desai belong to Royal family he did not want his son Raj Desai to have the urge to be proud of his so called 'Royal heritage / family 'because he felt Royality comes with responsibility and wisdom ..
But his family portraied the other wise behaviour .. which he did not approve off
From his grandmother to his own father.. had same kind of lusting behaviour.
Therefore Vasant Rathod became Prof Vasant Desai as he had adopted the surname of his family deevan Mr. VIBISHAN DESAI a wonderful person at heart .