Bhaktha Prahlada
Prahlada is a devotee of Lord Vishnu unlike his father who is an atheist. With admonitions along his way, he must change the way his father thinks.
Starring S. V. Ranga Rao, Anjali Devi, Roja Ramani, Relangi Venkata Ramaiah, Haranath, Mangalampalli Balamuralikrishna, Padmanabham, Jayanthi, Dhulipala, T. Kanagam
Watch "Bhaktha Prahlada" on Amazon Prime released in 1967. It's a drama and history movie, and has a rating of 7.9 out of 10 from Imdb which is usually fine for this kind of movie.