Uncle

An uncle was a name used to describe a male relative who was either the brother of a parent, or an individual who was married to the sibling of a parent. An individual who has an uncle would be the uncle's niece or nephew.

The Doctor's uncle on Gallifrey was known as the Uncle, which the Eleventh Doctor explained to River Song as being "a [Time Lord] thing". (GAME: The Eternity Clock, TV: Time and the Rani)

The uncle of Peter and David was a human inventor of time travel. (PROSE: Timechase)

Mollie Dawson had an uncle who fought in the Crimean War. (TV: The Evil of the Daleks)

Watkins was the uncle of Isobel Watkins. (TV: The Invasion)

Federico was the uncle of Giuliano. (TV: The Masque of Mandragora)

Tim Latimer had an uncle who had a six month posting in Johannesburg. (TV: Human Nature)

Digby Arwell was the uncle of Cyril and Lily Arwell. (TV: The Doctor, the Widow and the Wardrobe)

Liz Shaw had an uncle called Bernard (AUDIO: The Last Post) and another who worked at Eton. (AUDIO: The Blame Game)

Upon meeting her doppelgänger, Ann Talbot believed Nyssa may have been a relative and asked if she had an uncle Percy. (TV: Black Orchid)

Other references
"Bob's your uncle" was a British idiom. (TV: Hide)

Uncle Sam was a figure associated with the United States of America. (TV: Dreamland, The Sound of Drums) In 1959, CIA agent Jerome Weismuller claimed that a radio destroyed by Gavrok of the Bannerman was "property of Uncle Sam", to which Gavrok asked where their uncle Sam was as Hawk attempted to correct him. (TV: Delta and the Bannermen)

Uncle was an entrepreneur and crime lord from New Memphis (PROSE: Judgement of the Judoon)

Alongside Auntie and Nephew, Uncle was a servant of House. (TV: The Doctor's Wife)

Within the Dalek City on Skaro, the Twelfth Doctor quipped to Davros that his personal chamber was "exactly where you dump a smelly old uncle / family pet / genius scientist who couldn't even invent legs." (TV: The Witch's Familiar)