Descendants were lifeforms who followed from ancestors, beginning with their offspring (TV: The Dalek Invasion of Earth, The Stolen Earth) and continuing through successive generations. (TV: The Ark)
On Vortis, the Optera were descended from the Menoptera. (TV: The Web Planet)
The Slitheen-Blathereen family of Raxacoricofallapatorius were the descendants of an inter-clan marriage between the families Slitheen and the Blathereen. (TV: The Gift) Similiarily, a Hanazeen-Blathereen family also existed. (PROSE: A Comedy of Terrors)
Jabe of the Forest of Cheem claimed to be a descendant of Earth's tropical rainforest. (TV: The End of the World)
The 456 ambassador used the term, along with offspring, to clarify his order to John Frobisher for 10% of the Earth's children. (TV: Children of Earth: Day Three)
Historians who studied the Dalek race developed a theory, based off Bryant Anderson's research, that the humanoid races of Skaro might be the descendants of early humans transplanted onto Skaro by the Halldon. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe) The Time Lords believed the Kaleds were descended from the Dals. (PROSE: Dalek Combat Training Manual)
On 30 December in 9,000,000,000, the Great Upload took place as the descendants of the human race uploaded their consciousnesses to the cloud. They downloaded into bipedal meat bodies another 500,000 years later. (PROSE: Time Traveller's Diary)