The victim claimed that she was raped by her relative, who also made an obscene video of her to blackmail, they said.
She also said that the accused had extorted a sum of Rs 4.22 lakh in instalments from her, police said, adding the accused has been identified as Prem Kumar Bankar and the victim's daughter was engaged to his son.
A case has been registered under relevant sections of IPC including 376 for rape and 420 for cheating against the accused and probe will begin now, the police said.