 Throughout her time on the series, Mercedes' storylines have centered on her relationships.These include her marriages to Russ Owen (Stuart Manning), Malachy Fisher (Glen Wallace) and Dr. Paul Browning (Joseph Thompson), with her second marriage involving her in an HIV storyline, an engagement to Riley Costello (Rob Norbury) and a committed relationship with Joe Roscoe (Ayden Callaghan).She has also been central to several affairs which included Calvin Valentine (Ricky Whittle), her sister's husband, and Riley's father Carl (Paul Opacic).