Swathi (Khusboo) and Balu (Ramki) are a happily married couple expecting their first child. Their joy is short-lived when Balu's mother (Vadivikkarasi) sets conditions on the sex of the unborn child. If the child is female she will oust her son and his family from her home and will. Balu's friend, Raja (Vivek), and his wife wife Shanthi (Anju Aravind) deliver on the same day. Their babies are swaped by accident - Raju's son is shown to Balu's mother as her grandchild. Will Balu be able to maintain the lie without being exposed?