The deceased are identified as Ravindra Nagmal, his wife Surekha, and the boy.
According to police, the incident came to light this morning when neighbours went to Nagmals' house to inform them to fill drinking water, when they spotted the bodies.
The ten-year-old boy was staying with Nagmal family for his education. However, it is not known whether he was their relative.
A police official said they are investigating the cause behind the incident.