Police suspect that Ramesh (40), a small-time businessman and his 70-year-old mother Padma committed suicide after making his three daughters -- Swaroopa (8), Kaveri (5), Nandini (3) -- eat the poisonous food.
The incident occurred on the outskirts of Bhongir town.
All of them had consumed sweets, cold drinks and fruits laced with some pesticide which resulted in death, an officer investigating the case said, adding the bodies were recovered during early hours today.
A case has been booked with Bhongir Police and further investigations were on.