Geetam (1986)

Aparna (Geetha) becomes a teacher against her mother's wishes. At school Aparna meets a new student named Abhimanyu, whose father is a famous playwright, Yatheendran (Mammootty), a man whom she once loved. His latest play was inspired by her life. Aparna treated Abhimanyu as her own son until a mysterious man named Jagadeesh Nair (Mohanlal) who reutrn from USA who claimed that he was the biological father of Abhimanyu,soon Aparna learn that Abhimanyu was son of late twin sister also Jagadeesh's wife.