The incident happened last night after which the victim and her mother caught him, thrashed him and handed him over to the police, they said.
"The accused had returned home drunk last night. As there was a power cut in the area, his mother went to sleep on the terrace. Finding his 16-year-old sister alone in the house, the youth allegedly tried to misbehave with her and even tried to disrobe her in an attempt to rape her," said a police official.
The mother then caught hold of him, took him out on the street and thrashed him. She also asked her daughter to make a PCR call.
"We received a PCR call about the incident at 1.30 AM following which a team was sent to the spot and the accused was arrested," the official said.
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A case under section 354/354A/354B/354C/506 and Prevention of Children from Sexual Offences (POCSO) has been registered at Mianwali police station.
"He had been jailed in 2012 for a robbery in Mangolpuri area. He was released only a few months ago," said the officer.
The family lived in a rented one room accommodation.
The mother-daughter duo told police that the accused had allegedly tried to molest her even a fortnight ago in an inebriated state. The victim had complained to her mother who had scolded him. The matter was, however, not reported to police then.