The girl was taken to the residence by the youth's sister on March 13 following which she was raped by Nadeem (25), according to a complaint lodged by the victim's father.
The accused asked the girl not to disclose the incident to anyone, threatening otherwise he would circulate the clip on social media, police said.
Other family members of the accused were also present in the house when the incident took place, they said.
A case was registered yesterday on the directive of the SP City against Nadeem, his sister Afsana, father Ikram, uncle Kamil and mother Sarvari under sections 376 (rape), 120B (criminal conspiracy) and 506 (criminal intimidation) of IPC and POCSO Act, police said.
Meanwhile, in another incident, a 30-year-old woman was allegedly raped by a youth inside her house at Sujru village here yesterday, police said.
Police have arrested Zahid (30) and lodged a case against him in this connection, he said.