Unni and Ramakrishnan are sons of Easwara Pillai and Devakiamma. Unni is an executive, engaged to marry Meera and is under pressure to take the reins of her father's industrial empire. Ramakrishnan is a doctor who lives an unhappy childless life with neurotic wife Nirmala. Unexpectedly, their mother becomes pregnant at a late age. Mohanlal is forced to be a surrogate parent to the child, a role he takes a bit too seriously.