Police received an anonymous tip-off about the conditions the women were being held in and arrived to find what reports describe as a ‘private prison.’
The women were discovered restrained in a makeshift room.
The elderly man has now been arrested and charged, but his identity has not been disclosed by authorities.
Both sisters were shockingly thin and are reported to have suffered from severe malnutrition and dehydration.
Authorities believe the father began mistreating them after their mother left the house for a hospital appointment a year ago and never returned.
He reportedly told police that he tied up his daughters to ‘prevent them from falling out of their beds.’