Yvonne Casey is the mother of Claire Peacock. Little is known about her, but during Claire's battle with post-natal depression, Yvonne admitted she had not been close enough to Claire as a child. She occasionally appeared to babysit Freddie and Joshua and to support Claire during marital crises with husband Ashley. In 2007, Claire moved in with her following the arson attack which damaged the Peacocks house. She was shown to object to Claire's friendship with Casey Carswell. Claire then returned home.