Carla Langer

Carla Langer was the ex-wife of Paul, and mother of Clyde Langer.

Biography
Carla's former husband left her for her own sister, Melba, before vanishing completely. (He had gone to Germany.) (SJA: The Mark of the Berserker)

Her mother (more likely than her mother-in-law, since Clyde mentioned not knowing his father), Clyde's grandmother, was an old friend of Mrs. Randall, who lived at Lavender Lawns and tipped off Clyde on strange happenings transpiring there (SJA: Eye of the Gorgon) During the 2009 Dalek invasion she and Clyde were away together. (DW: The Stolen Earth)

Clyde said (although he may have been lying to prove a point) that she was unable to attend Sarah Jane's proposed wedding to Peter Dalton as she was at the time attending another wedding. (SJA: The Wedding of Sarah Jane Smith)

Behind the Scenes

 * In Clyde Langer's first appearance in Revenge of the Slitheen then in Warriors of Kudlak and The Nightmare Man he revealed a small part of his family history and mentioned that his father had left him.