The Allen Brothers were an Australian cabaret act of Peter Allen and singer and guitarist Chris Bell. Allen was then Peter Woolnough, when at the age of fifteen he met Chris Bell, part of a singing duo, The Two Shades. When the other member of The Two Shades departed it was Bell's father who picked the name Allen Brothers for Chris and Peter. They also sang with The Barry Sisters, an Australian backing group unrelated to the American Barry Sisters. The duo broke up at the same time as Allen's marriage to Liza Minnelli and Chris Bell went to America and formed a touring band called Boomerang in the 70's
(Source Wikipedia 2021)