A children's author has opened up about how her son's optimistic attitude inspired a social media campaign as he battles through leukaemia. British author Hannah Peckham - who is also the step-sister of Zoe Ball - began the #pantstoleaukaemia movement while four-year-old Bodhi was undergoing grueling treatment for cancer. Hannah Peckham began the #pantstoleaukaemia movement while four-year-old Bodhi was undergoing …