Six members of a family, including three children, were killed in Uttar Pradesh's Firozabad last evening after a fire broke out at a factory in the ground floor of the building where they lived. Three other members of the family were also injured in the fire and they have been admitted to the hospital for treatment, officials said. The fire that broke out at the inverter factory soon spread to the upper floor where the family lived, said Ashish Tiwari, Superintendent of Police, Firozabad.