The incident took place last night in Kandugula village of Huzurabad mandal, nearly 40 kms from here.
According to Huzurabad Assistant Commissioner of Police, M Ravinder Reddy, the couple--Ganta Komuraiah (30) and Ganta Komuramma (28)--took the extreme step after the parents of Komuramma accused her of practising sorcery.
Komuramma's parents had called her to their village Kondapur and chided her for allegedly indulging in black magic and witchcraft. They also held Komuramma responsible for their ill-health, which they suspected to be a result of such evil practises, the officer said.
Accordingly at about 11.30 pm, Komuraiah hanged his three daughters aged nine, eight and six respectively using a saree, police said.
Later, he and wife Komuramma hanged themselves in their house. The deceased used to earn their livelihood by selling toys.
The bodies have been sent for post mortem to Huzurabad Government hospital, police said adding further investigation is underway.