Lethbridge-Stewart family

The Lethbridge-Stewart family was a storied one. Notable members included Alistair Gordon Lethbridge-Stewart.

Origins
Originally the Lethbridges were from Devon, and went on to be the Lethbridge Baronets of Devonshire, while in Lanark, Scotland, the Stewarts were part of the Clan Stewart (PROSE: The Forgotten Son) and related to the Stuart kings of Scotland. When James VI arrived to claim the English throne as James I in 1603, the Brigadier's ancestor, William Lethbridge-Stewart, accompanied him. (TV: Terror of the Zygons, PROSE: The Dying Days)

Ancestors of the Brigadier
Alistair came from a military tradition. (COMIC: The Warkeeper's Crown)

Major General Fergus Lethbridge-Stewart was the Duke of Wellington's right-hand man at the Battle of Waterloo. (PROSE: The Scales of Injustice)

Archibald Hamish Lethbridge-Stewart, was a veteran of World War I who served at Ypres in December 1914. Archibald was kidnapped by the Testimony moments before his death to record his memories and met the First Doctor and Twelfth Doctor due to a timeline error and shared an adventure with them. Before his memory was erased, he asked the Doctors to look in on his family which they promised to do. Unknown to all but the First Doctor, the Twelfth Doctor altered time slightly in order to save Archibald and his German opponent by moving them forward in time a couple of hours to the beginning of the Christmas Armistice. (TV: Twice Upon a Time)

The Brigadier's paternal grandfather Alistair Lethbridge-Stewart worked for British Intelligence in Russia during World War I. He returned to the United Kingdom in the aftermath of the Russian Revolution of 1917. (PROSE: The Wages of Sin)

The Brigadier also had a "great uncle" Mario, really a second cousin of the Brig's Granny McDougal. (AUDIO: The Ghosts of N-Space)

The Brigadier's father, Gordon Conall Lethbridge-Stewart, ended his life as a wing commander in the Royal Air Force in World War II, and was listed as missing in action in 1945. (PROSE: The Forgotten Son)

Descendants of the Brigadier
The Brigadier had many descendants who played significant roles in the history of Earth.

Mariama and his descendants
As a young officer stationed in Sierra Leone, Lethbridge-Stewart fathered a son with Mariatu, daughter of Chief Yembe of the Royoke village. This son, Mariama, was the father of Kadiatu. Kadiatu authored The Zen Military, an exposé of the activities of UNIT published in 2006.

Kadiatu's great-grandson, Yembe Lethbridge-Stewart, led the UN forces during the Thousand Day War between humans and Ice Warriors in the late 21st century and was the adoptive father of Kadiatu Lethbridge-Stewart, whose time travel activities at first proved quite troublesome for the Seventh Doctor. (PROSE: Transit)

Kate Lethbridge-Stewart and her descendants
With his first wife, Fiona, the Brigadier fathered a daughter named Kate. Kate was estranged from her father for six years and it was not until the events surrounding the Great Intelligence's third attempt to conquer Earth in the 1990s that Lethbridge-Stewart learned Kate had given him a grandson, Gordon Lethbridge-Stewart. (PROSE: Downtime) Jonathan was the father of Gordon. But when Gordon was two years old Jonathan left the family. Neither Gordon nor Kate saw him again. (HOMEVID: Downtime) Kate later bore a second child. (TV: Death in Heaven) Around the 2010s, Kate was one of the leaders of at least the British division of UNIT. (TV: The Power of Three)

Behind the scenes
In the unproduced Doctor Who 30th anniversary special The Dark Dimension Alistair Gordon Lethbridge-Stewart also had a son, Alexander Stewart, who died in 1979 at the age of ten.