The father, mother and step father were among eight persons taken into custody by police at nearby Paravoor today, police said.
A case has been registered against the accused and they are being questioned and their statements being recorded, police sources said.
The parents of the girl had separated.
Autorickshaw drivers saw the girl at night and brought her to the police station. When questioned by woman cops, the girl narrated her plight, the sources said.
In another incident from Ernakulam district recently, a six-year-old girl from Kurumpady was allegedly sexually abused by her 40-year-old father for six months after forcing her to drink alcohol.
Police have registered a case against the accused, who is absconding following a complaint from the girl's mother that the child's father had been sexually abusing her for the past six months. Case has been registered against the girl's father under Protection of children against sexual offences Act and Sect 328 of IPC (giving liqour to a minor).
Incidents of fathers sexually abusing and raping their daughters had been reported in from Kottayam and Kannur districts recently.
In Kottayam, police had arrested a man who had been alleged sexually abused his two minor daughters for the past two years.
The man, a hotel employee, has been charged under sections 376 (rape) and 377 (unnatural offences) of the IPC.
While in Dharmadom in Thalassery in Kannur district. A 13-year-old girl was raped by her father, 15-year-old brother and and uncles for nearly two years. One of the accused died two days ago.