Gordon James "Gordy" Lethbridge-Stewart was the son of Kate Lethbridge-Stewart and Jonathan James. His maternal grandparents were Fiona and Alistair Gordon Lethbridge-Stewart. Doris Lethbridge-Stewart was his step-grandmother. (HOMEVID: Downtime; PROSE: Downtime; TV: Battlefield) His paternal grandparents were Pattie and Harry James, and his uncle was Danny James. (PROSE: An Ordinary Man, The Forgotten Son, Of the Future)
Gordon was born on 25 September 1990. (PROSE: Of the Future) He was brought up 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's first name was his grandfather's middle name, and great-grandfather's first name. His middle name was his father's surname and his great-uncle's name. (HOMEVID: Downtime) He became the third Gordon Lethbridge-Stewart in his recent family history. (PROSE: The Forgotten Son)
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. Following recent events at New World University, Gordon acquired an imaginary friend called Danny and mentioned this on first meeting his grandfather. (HOMEVID: Downtime)
As Gordon grew, he stopped talking about Danny, who was last mentioned when Gordon was around seven. After much badgering from her father, Tamara and Beth, Kate put Gordon into a normal school and settled down in a house in Streatham, London. Gordon grew very close to his cousin, Conall Lethbridge-Stewart, and they were in the same class. When they were about eleven, Gordon was the first to find out Conall was gay. (PROSE: Downtime: Child of the New World)
By September 2004, Gordon was dating Lawrencia Mohibar, although his mother did not learn this until his fourteenth birthday. (PROSE: Downtime: Child of the New World)
Behind the scenes
The in-universe article A Brief History of the Lethbridge-Stewarts, available as a download from the Lethbridge-Stewart website, says Gordon Lethbridge Stewart III "is making waves of his own". Because it is non-narrative, it is not a valid source on this wiki.