Tamil Nadu CM Vijay's farewell film 'Jana Nayagan' may end up clashing with his estranged son Jason Sanjay's debut directorial 'Sigma'. Several reports claimed 'Jana Nayagan', which was originally scheduled to release in January, may release by July-end after CBFC awarded it 'A' certificate last week. The makers of 'Sigma' have reportedly pushed release date from July 31 to August.