Mukesh Khatik (30), his wife Meena (27) and daughter Dabu (2) were found unresponsive by a relative living next door when he brought dinner for them late last night at Khatik Colony, Inderganj police station incharge R S Tomar said.
Meena's brother knocked at their door for a while after which he entered the room to find the three unresponsive. He along with other family members rushed Mukesh and his family to a hospital where a doctor pronounced them brought dead, Tomar said.
The bodies have been sent for post-mortem and the exact reason of their death will be known once the report is out, he said.
A case has been registered and police are further investigating, he added.