Natalie Smith revealed that he recorded episodes of previous series and believes his expertise will help him win the show.
"I don’t know anyone who knows Big Brother like Brian does," she told the Daily Star Sunday. "Since series one he’s been a huge fan. He taped it and has got every single spin-off show on tape, too.
"He follows Big Brother religiously. He did media studies at college and did a Big Brother task for his exam."
Smith continued: "He took clips from different series and made it into a project. He applied to go on the show himself three times. He was told last year that he’d just missed out."
She also said her cousin was more intelligent than he seemed: "He’s not stupid. He loved school, he loved doing work. He got As to Cs in at least four of his GCSEs."