NEW DELHI, Aug. 23 -- A day after a 31-year-old man died after being allegedly assaulted by his wife's family members in Nihal Vihar, police on Saturday arrested four people, including the wife, in connection with the case, said police officers aware of the case. The deceased, Vinay Gupta, a resident of Laxmi Park, worked as a software engineer at an MNC in Noida, police said. He married Rekha, 31, around three-and-a-half years ago, and they have four-month-old twins. According to police, the incident took place on Friday morning after Gupta asked his wife to apply medicine to their son as he had developed blisters on his body. "The two allegedly got into an argument after she refused. Soon after, Rekha left the house and called her two brothers and sister-in-law," a senior police officer said. Her brothers, Raju Jindal alias Rajkumar, 37, who is a chartered accountant, his wife, Poonam, 35, and Vedprakash Jinal, 33, who runs a cloth shop in Rithala, immediately visited their residence and allegedly assaulted Gupta, who later succumbed to his injuries, police said. Investigators said Rekha had switched off the CCTV camera installed inside the house before the incident. "However, footage from cameras installed by neighbours allegedly captured her family members arriving at the house," the officer said. Gupta's father, Prem Chand, who lives in the house with his wife, Renu Gupta, said Rekha's relatives told them that they had come to speak to his son. "I went inside to get water, and when I came out, they started assaulting my son," he said. Rekha, Raju, Vedprakash and Poonam were arrested after a case under sections 103(1) (murder) and 3(5) (acts done by several persons in furtherance of common intention) of the Bharatiya Nyaya Sanhita (BNS) was registered at the Nihal Vihar police station, police said....