Chris McCausland, Flo and Joan, The Orielles, Dallas Campbell, Kiri Pritchard-McLean, Dorothy Koomson

Comic, Strictly winner and Live Comedy Day ambassador Chris McCausland joins Kiri Pritchard-McLean for a chat about siblings. Chris remembers pitched battles aged 11 with his then four year old sister over TV rights. Comedy cabaret duo Flo and Joan are sisters Rosie and Nicola Dempsey who do perform songs about slipping each other poison in their tea. But we think that's a joke.The Orielles too are a trio made up of the Hand-Halford sisters who bumped into guitarist Henry at a party aged 9 and are are now on their 4th record. The best selling thriller writer Dorothy Koomson admits to writing anybody who crosses her into her books, complete with sticky ending. And the space historian and broadcaster Dallas Campbell explains why the astronomer Galileo may have shopped in a 16th century middle aisle.Presenter: Kiri Pritchard-McLean Producer: Olive Clancy