Charna Singh, a resident of Bharaj village in the district, was today booked on the charge of raping his two minor nieces.A case was registered under Sections 376 and 506 of the IPC and Sections 4 and 6 of the Prevention of Children from Sexual Offences Act on the complaint of the elder victim.Charna, the uncle of two sisters (aged 15 years and 13 years) from Halotali village near Patiala, allegedly raped them at his house when their mother was admitted to a hospital in Patiala.The siblings were admitted to the Civil Hospital here last night, where Dr Neha, a gynaecologist, examined them.The doctor said she had collected samples which would be sent by the police to the chemical examiner for testing.The accused is yet to be arrested.