Overview: Stacey meets five sisters in Lancashire who only found each other as adults. They know they all share the same mum but want to find out if they also have the same father. Luke was a sperm donor as a university student in the late 1980s. He’s now come forward to find out if any potential children might be looking for him. After losing their mother to cancer, identical twins Diane and Louise want to test their DNA to discover if they both carry the cancer-causing BRCA genetic mutation.