Premise: Barry Alan Crompton Gibb , ( born 1 September 1946 ) is a British singer , songwriter and record producer who rose to worldwide fame as a co-founder of the group Bee Gees , one of the most commercially successful and critically acclaimed groups in the history of popular music . Bee Gees . Their line-up consisted of brothers Barry , Robin and Maurice Gibb .
Hypothesis: Barry Gibb is an only child.
Label: CONTRADICTION