Cousin

A cousin was a familial relation. The use of the word was relatively broad to describe individuals of similar origin, such as when the Third Doctor described the people of Atlantis and Athens as cousins. (TV: The Time Monster) A member of the Slitheen family refered to their cousins from the Blathereen and Hazrateen family. (AUDIO: The Taste of Death)

In 2007, Martha Jones' cousin Adeola Oshodi died during the Battle of Canary Wharf. (TV: Army of Ghosts) She would note that they had shared a resemblence. (PROSE: Made of Steel)