David Rooke admitted false imprisonment and ABH, his son Jamie, 19, to ABH and affray and Donna Rooke to battery.
32 year-old Craig Kinsella was kept in the family's garage and made to scavenge for food from bins.
Craig, who has learning difficulties, was made to work from 7:30 am until midnight and beaten with pick axe handles.
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Detectives say Samantha Davies, 16, and Lauren Johnson, 17, are believed to be in West Yorkshire.
The 43-year-old man pleaded guilty to 11 offences at Sheffield Crown Court today
Detectives investigating the fatal shooting of a 23-year-old man in Sheffield want to trace the movements of a Volkswagen Golf car.