Henry Lethbridge-Stewart

 was the nephew of Alistair Gordon Lethbridge-Stewart. His father was Alexander Stewart. His wife was Olivia. They had two children, a boy named Julius and a girl. (PROSE: Faithful Friends: Part 2)

Henry and his family were from a parallel universe, one of the many realities witnessed by James Gore when he crossed universes from Inferno Earth to the main Earth. (PROSE: The Man from Yesterday)