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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He won a dramatic quarter-final 3-2 over Egypt’s World No.10 Tarek Momen at the World Series tournament held in Hull’s Airco Arena.
Bereaved parents were told that the council is concentrating its efforts on making sure it doesn't happen again.
The rheas, named Sally and Harry by staff looking after them at a farm in Haxey, were both found in the Sprotborough area.