Gordon James Lethbridge-Stewart was the son of Kate Lethbridge-Stewart (a.k.a Kate Stewart) and a man named Jonathan. He was the grandson of Fiona and Alistair Gordon Lethbridge-Stewart. Doris Lethbridge-Stewart was his step-grandmother. (HOMEVID: Downtime; PROSE: Downtime; TV: Battlefield)
Gordon was born in late Septemer 1990. He was reared by Kate as a single parent, initially aboard a narrow houseboat moored on an English canal. His father, Jonathan, chose not to be a part of his and his mother's lives after Kate refused to marry him. (PROSE: Downtime) Gordon was nearly five years old before he met his grandfather, Alistair, Kate having kept her pregnancy and Gordon's existence a secret from her father. (HOMEVID: Downtime)
Gordon's first name was his grandfather's middle name. (HOMEVID: Downtime)