Craig Kinsella’s ordeal began when he was taken on as an employee of the Brooke family five to six years ago.
To begin with it was paid employment cleaning ice-cream vans but then the payments stopped.
Mr Kinsella was asked to sleep in the family’s garage on Halifax Road one night and keep watch because they were worried about being burgled.
But they refused to let him go, keeping him against his will and subjecting him to daily beatings which were caught on their own CCTV system.
The offences took place at the family’s home during a six-week period between May and July last year, during which time the violence escalated.
David Rooke was jailed for six-and-a-half years after he admitted false imprisonment and five counts of causing actual bodily harm. He was also ordered to pay Mr Kinsella £15,000 in compensation.
Jamie Rooke admitted affray and four counts of causing actual bodily harm and was jailed for four years.
Donna Rooke admitted a specimen count of battery and was jailed for four months.
Det Insp Vicky Short, who led the investigation, said: “The physical and mental abuse meted out by the family on a highly vulnerable man plumbed the depths of depravity.
“David, Donna and Jamie Rooke abused Mr Kinsella for their own pleasure, until his spirit and will to stand up for himself and fight back was crushed. It is hard to understand how any human being could treat an individual in such a grotesque, callous and inhuman manner. I am confident that, if we had not received that phone call that day last July, we would have been investigating a murder.”