New Delhi, Jan. 6 -- A 25-year-old man allegedly murdered his mother, sister and 14-year-old brother at their house in east Delhi's Laxmi Nagar, police said on Monday, adding that the accused said he was "under severe financial stress" and had not been working for several months. Investigators said the man allegedly fed his family sweets laced with a sedative before strangling them to death. The accused, Yashveer Singh, a cab driver, walked into the Laxmi Nagar police station around 5pm and surrendered, confessing to the killings. He told officers he had mixed dhatura - a poisonous plant - into the sweets, though the exact substance is yet to be confirmed as Singh has been repeatedly changing his statements. Deputy commissioner of police (east) Abhishek Dhania said, "Around 5pm, Singh came to Laxmi Nagar police station and stated that because of financial distress, he had killed his family members. Police teams immediately rushed to the address given by him. On verification, the bodies of his mother, sister and brother were found inside the house." The victims were identified as 46-year-old Kavita Singh, her 23-year-old daughter Meghana, and her 14-year-old son Mukul. The family lived in a rented flat. Yashveer's father works as a truck driver and is mostly away. "He told us that for the last seven months, he couldn't pay the Rs.20,000 rent and was facing mounting pressure," an officer said. The final trigger was his wife leaving him on Sunday after an argument over his gambling and alleged drug addiction. Police said Singh also claimed he had taken out a Rs.1.5 crore life insurance policy and had made multiple failed suicide attempts. On Monday, his mother scolded him and asked him to stop hurting the family. Another officer said, "He claimed that his mother said something along the lines of everyone dying to end the family's problems. He says this provoked him, but he keeps changing his version." According to his statement, he fed his family sedative-laced sweets between 2pm and 3pm. After they became unconscious, he allegedly strangled all three with a muffler around 3pm. Forensic teams collected samples, and autopsies will determine the exact cause of death. Neighbours described the family as quiet and reserved. Sanjeev Kumar, a neighbour, said, "He was mostly jobless. His family was very religious and kept to themselves. I still cannot believe that three people were killed in front of our house." Police said Yashveer has been arrested and is being interrogated. His wife and father have been asked to join the investigation....