In a gruesome incident, four members of a family were burnt alive following a family dispute at Cheenikuzhi near Thodupuzha in Kerala's Idukki district last night.<br />''<br />''Police said a 79-year-old man set fire to the house after dousing it with petrol, killing his son, wife, and their two teenage daughters. The man has been arrested.<br />''<br />''<br />''<br />