Two members of a family were killed and three others injured when the roof of their house collapsed here early on Monday, the police said.A police official said the incident took place in Dwarka's Hari Vihar area at around 3 a.m.When the police reached the spot, all the five members were stuck under the debris. They were rescued and rushed to a hospital.Sunil, 40, and his wife Rachna, 40, were declared brought dead at Deen Dayal Upadhyaya Hospital. Their children -- Vaibhav, 19, Gulshan, 16, and Gungun, 9, were injured and were now stable, a police official said.Vaibhav told the police that the roof collapsed due to seepage.