Suresh Kumar (25), a resident of Khod village near Pataudi, 28 km from here, was arrested on a tip-off. A court remanded him in police custody for four days.
The victims -- Phoolwati (62), her son Manish (28) and Manish's wife Pinky (24) -- from Brijpura village near Pataudi were found dead in their house on August 29, police said.
Pinky was found hanging from a ceiling fan.
The couple's one-year-old daughter Charu was lying on the floor with a head injury. She later died in a hospital.
Police had formed a special investigation team (SIT) to probe the crime.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
