A 32-year-old man, his wife and their five-year-old son were found dead with their throats slit at their home here in Uttar Pradesh, police said on Tuesday.The incident took place in Perajor village on Monday night. The dead were identified as transporter Ram Sagar Singh, Sheela Singh, 30, and Hariksesh, 5.The macabre incident came to light when neighbours noticed that no one had ventured out of their home on Tuesday. Some villagers saw the bodies in a pool of blood. Police told IANS that the way they were murdered reflected revenge killing.