Sesham Kazhchayil 1983 on netflix

Sankar Mohan (Master Sujith) is a spoilt child of a wealthy widower Mr. Varma (Ummer). Fed up about having to change schools multiple times due to his behaviour, Mr. Varma appoints a teacher Lathika (Menaka) to homeschool Sankar. The duo get along well; but eventually the child starts getting possessive about Lathika. Meanwhile Lathika starts falling for Sankar’s swimming coach (Mammootty) who is a playboy much to the chagrin of Shankar.