Sophie Blake (referred to as Katy and ​​​​​​Ursula by Warren) is the newborn baby of Sienna Blake and Warren Fox, born on 7th November 2017. Sophie is named after her half-sister, Nico Blake (originally named "Sophie Blake" herself), who was believed to have been killed in a fire in November 2016. She has a twin brother named Sebastian Blake and two half siblings: Joel Dexter from her father's side and Nico from her mother's side. Warren kidnapped Sophie from the hospital and went on the run with her leaving Sebastian with his mother.

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