Cheryl Cole's brother was like a ''crazy person'' when he discovered their dad wasn't his biological father.
The 'Call My Name' singer has opened up about the moment her family fell apart in her childhood home in Byker, Newcastle upon Tyne, Northern England, and revealed the pain and hardship that her parents and siblings went through.
Cheryl, 29, describes the moment she and her siblings discovered they had different dads in her autobiography 'Cheryl: My Story', saying: ''My brother Andrew had burst in the front door in a terrible rage. I'd never ever seen him in such a state and he started ranting and raving at my mum and dad.
''They looked really worried and my heart started beating super-fast. 'I'll explain it,' mum said. Her eyes looked sad and she had deep frown lines in her forehead.
''Dad had gone all quiet, which panicked me. The atmosphere felt chaotic. 'Is dad my real dad?' Andrew screamed in my mum's face.
''I swear the clock stopped for a second. He said someone told him in the street that my dad wasn't his real dad.
''Andrew was going so berserk that he looked like a crazy person. But however mad he looked, this was sounding horribly realistic.''
Cheryl's mum Joan Callaghan gathered her and her siblings around the table and revealed the truth, that her older brothers Joe - who was not present - and Andrew and sister Gillian had a different father from Cheryl, who was 11 at the time, and her younger brother Garry.
The Girls Aloud star admits the revelation tore the family apart.
Cheryl believes it was this incident that ultimately caused her mum and dad, Garry Tweedy, to separate and was the start of her sibling Andrew's problems with the police.
In the book, she adds: ''Mum and dad split not long after. Dad had an affair and mum tried to take him back, but they couldn't make it work anymore.
''The stress of bringing up five kids on her own, with the police banging at the door all the time, must have been hard to cope with.
''When Andrew was 15 he stabbed someone in a fight. This guy had punched Gillian in a pub. Everyone was in pieces. People were talking about prison, and I was lying awake again, worrying myself sick.''
Her brother Andrew was sent to a young offenders' institute for the offence and has gone on to receive over 50 criminal convictions, while his life has been blighted by drink and drug abuse.