Apoorva Raagangal
A young man and an older woman fall in love and decide to marry. However, their lives become more complicated when he learns that his father is in love with the same woman's daughter.
Starring Kamal Haasan, Major Sundarrajan, Srividya, Jayasudha, Nagesh, Rajinikanth, Kannadasan, Jaishankar
Watch "Apoorva Raagangal" on Amazon released in 1975. It's a drama and romance movie, and has a rating of 7.5 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.