Kissa Puran : What Happened to Luv Kush after Lord Shri Ram - Mata Sita

After the demise of Mata Sita and when Lord Shri Ram left the country, what happened to his sons Luv and Kush. How Lord Ram's Brothers handled the dynasty and ruled various places in the world. Know what actually happened to RAGHUVANSH after Lord Ram and Mata Sita.