Singer-songwriter KT Tunstall always knew she was adopted and in 1998 was reunited with her birth mother, who told her that her father never wanted to give her up - a message that has inspired her to find out what happened to him. Brother and sister Simon Munro and Carole Killick grew up apart after their mother left when they were young in the 1960s, but the siblings were reunited more than 20 years ago and are now searching for their mother.