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A sibling was an offspring born from the same parent or parents as another offspring.
The Thirteenth Doctor recalled having once had sisters. (TV: Arachnids in the UK [+]Loading...["Arachnids in the UK (TV story)"])
Romulus and Remus Sylvest were twin brothers. (TV: The Twin Dilemma [+]Loading...["The Twin Dilemma (TV story)"])
Blon Fel-Fotch Passameer-Day Slitheen referred to Jocrassa Fel-Fotch Passameer-Day Slitheen and another as her brothers. (TV: World War Three [+]Loading...["World War Three (TV story)"]) Following their deaths, Blon recalled that she had "wonderful" and "bold" brothers. (TV: Boom Town [+]Loading...["Boom Town (TV story)"]) Glune Fex Fize Sharlaveer-Slam Slitheen and Kist Magg Thek Lutiven-Day Slitheen were brothers. (TV: Revenge of the Slitheen [+]Loading...["Revenge of the Slitheen (TV story)"])
Richard Macduff was falling behind in his "ever more desperate attempts" to rescue his "somewhat shaky" relationship with Susan Way, the sister of his boss, Gordon Way. (PROSE: "Richard Macduff" [+]Part of Who's Who, Loading...{"namedpart":"Richard Macduff","1":"Who's Who (DGHDA feature)"})
The Krillitane who identified himself as Brother Lassar referred to his fellow Krillitanes as his brothers. (TV: School Reunion [+]Loading...["School Reunion (TV story)"])
Martha Jones voiced her belief that the Tenth Doctor was going to reveal that the Saxon Master was his "secret brother or something", which the Doctor attributed to her watching "too much TV." (TV: The Sound of Drums [+]Loading...["The Sound of Drums (TV story)"])
The Doctor's TARDIS considered other, fallen TARDISes to be her sisters. (TV: The Doctor's Wife [+]Loading...["The Doctor's Wife (TV story)"])
Omega referred to other Time Lords as his brothers. (TV: The Three Doctors [+]Loading...["The Three Doctors (TV story)"]) During the Last Great Time War, Seratrix's followers likewise referred to themselves as brothers. (AUDIO: The Thousand Worlds [+]Loading...["The Thousand Worlds (audio story)"], The Heart of the Battle [+]Loading...["The Heart of the Battle (audio story)"])