Since the area was experiencing rains for the last three days, the concrete ceiling, which was already in dilapidated condition, was totally wet, police said.
A portion of the ceiling came down on the 26-year old Tulasimani, Kanishka (3) and Rakshana (2), who were sleeping around 3 AM, they said.
Hearing cries from inside the house, some neighbours rushed and rescued the trio and taken to Government hospital here.