The police said the case was registered at the Makhi police station on court's December 17 order against the family members for various alleged offences of cheating and forgery.
The CBI recently named him in a charge sheet for allegedly raping the minor girl at his residence on June 4, 2017 night but the local police had not registered the FIR after the crime.
The sources said the chargesheet was filed before Special CBI court in Lucknow and names Sengar and his alleged associate Sashi Singh as accused in the case.
On Thursday, an FIR was lodged against Sengar in connection with the alleged rape after the state government decided to hand over the probe to the CBI.
