Police said the girl had been abused for more than six months and man's wife was also too scared to complain to the police as he had threatened to kill her.
Bavan (name changed) had tortured his wife also regularly. The man behaved weirdly in the nights and claimed that his daughter was his second wife.
Alerted by neighbours, the Child Line officials rescued the girl and complained to the Police.
A case under Protection of Children Against Sexual Offences Act had been filed, police said.