The man was kept at the property and forced to participate in manual labour. Picture: Thames Valley Police

According to The Mirror, Christopher Joyce, 82, and his daughters Mary Joyce, aged 60, and Helen Collins, aged 46, of Oxford, were found guilty by unanimous jury after a four week trial at Oxford Crown Court.

The court heard that the family forced the man, who suffers from severe learning difficulties, to perform menial tasks around their caravan park and made him sleep in a shed so their dogs could live in his caravan.

CCTV footage showed Mary Joyce, 59, pushing and shouting at the 51-year-old, and her father Christopher Joyce beating him with a broom handle.

The man was kept at the property and forced to participate in manual labour. Picture: Thames Valley PoliceSource:Supplied

Earlier this year a court was told the defendants had also been applying for and collecting the man’s benefits – a total of AU$210,000 from 2002 to 2015.

Thames Valley Police senior investigating officer, Det Chief Insp Mark Glover from the Major Crime Unit, said: “Firstly, I would like to acknowledge the bravery of the victim in this case for coming forward and speaking to police about what happened to him.

“The Joyces and Collins claimed that the victim was like a family member, but the evidence showed that no family member was treated remotely like he was.

A family member chases the disabled man with a stick. Picture: Thames Valley PoliceSource:Supplied

“He was a vulnerable man who had no family or friends that he felt he could turn to, and he felt he had nowhere else to go. A consultant forensic psychologist found that because of a lifelong learning disability, the victim lacked the capacity to remove himself from the circumstances in which he lived for 35 years.

“Instead he was used by the Joyces and Collins for hard manual labour and demeaning tasks such as cleaning up dog mess and tying their shoes, while he was made to sleep in a brick wash house and paid very little money, while he and his co-defendants claimed his benefits and kept them for themselves.

The disabled man was too scared to leave the property permanently. Picture: Thames Valley PoliceSource:Supplied

“I hope that this conviction will demonstrate that treating another person like this will not be tolerated.

“Convictions for forced or compulsory labour are challenging to secure due to the complex nature of the investigation, particularly when some of the offences are historic.

The family members will be sentenced on a later date.