For the children and parents in this episode, tough life lessons have an added dimension, but they're determined to push on through, in the face of uncertainty. Four-year-old Rosie has leukaemia. Her dad Chris has put normal life on hold to become her full-time carer as he and her mum Jenny do everything they can to help Rosie in her fight to get better and start walking again. Fifteen-year-old Joseph was involved in a serious road traffic collision six years ago. He still struggles with serious hip pain and with GCSEs looming his mum is determined to find out the cause and get him off of the painkillers in time for his exams.

This episode explores the 'superhuman' qualities that parents can develop when their children need them. It follows mums and dads who surpass all expectations and whose lives change for ever. Rob, who's 55, has swapped life on the road as a long-haul trucker for glitter, princess outfits and repeated viewings of Frozen after becoming the primary carer for his four-year-old daughter Chelsea. Chelsea was born with a serious kidney disorder and has spent more than 200 nights of her life in hospital. She had a transplant last year, and Rob is balancing his constant worry about Chelsea's health with a new sensitive side and happiness he'd never imagined he could have. Meanwhile, mum Shafak is bringing up four children by herself, including seven-year-old Eman, who also has a kidney condition, meaning more than a cupful of water a day could kill her.