Cardiff sisters learn they are identical twins following leukemia diagnosis
Two Cardiff sisters, Caitlin and Grace Leggett, who believed they were fraternal twins, discover they are identical after Caitlin is diagnosed with acute myeloid leukaemia; Grace’s initial stem cell donation would not work due to near-identical DNA, prompting a search for another donor and Caitlin's journey through chemotherapy, radiotherapy, and a successful transplant from an anonymous donor, with both urging people to sign up as stem cell donors.