Gumla: A 35-year-old man allegedly hacked his elderly father and wife to death and critically injured his three-year-old daughter at Sengratoli village in Lohardaga district on Monday morning following a dispute, police said.The deceased have been identified as Surendra Oraon, 60, his daughter-in-law Sujata Oraon, 27. The accused, identified as Sandeep Oraon, 30, was arrested. Injured Riyanshi is undergoing treatment at Rims in Ranchi.Police said the argument escalated around 5 am, after which Sandeep picked up an axe and attacked his father first. He then hit his wife and daughter.Hearing screams, neighbours rushed to the house but found Surendra and Sujata dead, while the child was writhing in pain. They immediately alerted the police.Bhandra police station officer in-charge Manoj Kumar Gupta, who reached the spot with his team, rushed the injured child to the local community health centre (CHC). “After preliminary treatment, she was referred to Rims,” he said. Police have recovered the axe, he added.“Preliminary investigation suggests the incident was the fallout of a family dispute, though police are thoroughly investigating all aspects. The accused is being questioned to ascertain the exact reason,” he said.Villagers claimed Sandeep’s behaviour had appeared unusual recently, with frequent quarrels breaking out in the family.