Mishrilal Patel complained that his son Narpat Kumar Patel was murdered by Tanu Kanwar and five members of her family, police said.
The victim's father also accused them of destroying evidence, they said.
The alleged incident, according to the complaint, took place between October 8 and October 11 last year.
However, the victim's body has not been recovered yet, they said.
An FIR was registered under sections 302 (murder), 201 (causing disappearance of evidence of offence), and 120 B (criminal conspiracy) of the IPC, sources said, adding investigation is on.