George Maitland was the father of Artie Maitland and Angie Maitland, the children for whom Clara Oswald nannied after the death of his wife. (TV: The Bells of Saint John) Once he was coping well enough on his own, Clara took a teaching job at Coal Hill School. (PROSE: Normality, TV: The Day of the Doctor)
Behind the scenes
Although "Maitland" is never expressly given as George's surname, "Maitland_Family" is the name of the household Wi-Fi network and the Eleventh Doctor mentions that "Mr Maitland went next door" in The Name of the Doctor.