The only murderer in the family? When serial killer Robert Spahalski admitted to murder in 2005, police not only discovered his decades long criminal past but also a fascinating family history that raises the possibility of a genetic tendency towards violence. Dr Julia Shaw and Sofie Hagen investigate the age-old concept of “bad families” and ask whether criminal behaviour is passed down through generations. And if so, is it through genes, our environment or our experiences? CREDITS Presenters: Dr Julia Shaw and Dr Adam Rutherford Producer: Laura Northedge Assistant Producer: Hannah Ward Editor: Anna Lacey Music: Matt Chandler Commissioning Executive: Dylan Haskins Commissioning Assistant Producer: Adam Eland #BadPeople_BBC