The bodies of a woman and her two children were retrieved from a farm well at Korakkaivadi near Thittakudi on Wednesday.
Police sources said that Sangeetha, wife of Chandran employed as a driver in a private school, along with her children Sivasankari (1) and Kumaran (5), left the house on Tuesday morning but did not return.
Passers-by, who first noticed the body of the boy in the well, informed the police.
Later, with the help of the local people and Fire Service and Rescue Department, the bodies of all the three persons were recovered.
They were sent to the Thittakudi government hospital for post-mortem, police said.