Carla's former husband left her for her own sister, Melba, before vanishing completely. She later learned that he had gone to Germany. (TV: The Mark of the Berserker) After Paul ran off, Clyde and Carla moved from Hounslow to 2 Renfrow Street in Ealing. (TV: The Curse of Clyde Langer, Revenge of the Slitheen)
Carla Langer worked at a library. Twice a year they were doing a stock over where the employees were trying to find out which books, CDs and DVDs had been borrowed and never returned, had been misfiled or had vanished. Each time they did a stock over Clyde helped out.
Clyde's grandmother - more likely Carla's mother than mother-in-law - was an old friend of Mrs Randall, who lived at Lavender Lawns, and told Clyde of strange happenings transpiring there. (TV: Eye of the Gorgon) When Luke Smith was going to live with Bloorm Vungah Bart Slitheen and Dax Fex Fize Slitheen who posed as Heidi and Jay Stafford Carla told Clyde that he should go and see if he could help. She didn't want him to help at the stock over. Carla knew how important Luke was to Clyde. (PROSE: The Lost Boy)
When Clyde went missing (actually kidnapped by Mr Smith), Carla phoned Maria, who assured her he would be safe. (TV: The Lost Boy) During the 2009 Dalek invasion, she and Clyde were away together. (TV: The Stolen Earth)
Carla was one of the many affected by Hetocumtek's curse, causing her to turn on her own son and call the police after him. When Clyde defeated Hetocumtek and the curse was lifted, she embraced Clyde when he returned home. (TV: The Curse of Clyde Langer)
Carla was a very caring and loving mother to Clyde, though she delighted in teasing and embarrassing him in public. She supported her son's talents at drawing and cooking. She was very tolerant — she let Clyde have a day out with Paul the day he returned to their lives because Clyde wanted to. (TV: The Mark of the Berserker, The Empty Planet, The Curse of Clyde Langer)