The 21-year-old singer explained that years of abuse at the hands of his father Eustace drove him to almost kill himself, but his brother Daniel stopped him at the last minute.
"Everyday was like a living hell. We would all get beaten, with Mum, Daniel and me getting the worst of it," he told The Sun.
"I couldn't see a way out so I locked myself in the bathroom and tried to take a load of pills but Daniel smashed through the door and said: 'Are you being stupid? Do you know how much we all love you?'
"He saved my life that day."
Daniel committed suicide himself three years later. Speaking about his brother's death, Douglas said: "Three years later things just got too much for my brother and he broke, I think that killing himself was his way of taking some power back from our dad.
"Daniel was an inspiration to me on so many levels. He was an amazing person, who excelled at everything he did.
"When things were at there worst with dad, talking to him helped me escape mentally. Then, when I was at my very lowest, he was there for me. He literally saved my life."
Last month, Douglas said that he was "relieved" that his past has been revealed in the newspapers.
Eustace Douglas was sentenced to nine years in jail in 2003 for hitting the singer's mother Mandy Thomas.