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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Humberside Police are to begin a trial where officers use spit guards. A quarter of injuries to officers are caused by spitting or biting.
Ian Moore, aged 40, went missing from Grantham on April 6.
Detectives are investigating after a man died following a fire at house in Harehills this morning.