What is the name of Tommy Shelby's sister?

Tommy Shelby’s sister is Ada Shelby. She is the only sister among Tommy’s siblings and is portrayed by Sophie Rundle in Peaky Blinders.

Ada begins the series as the sibling least involved in the family’s criminal activities. She secretly marries Freddie Thorne, a communist activist and former soldier, and initially tries to build a life separate from the Peaky Blinders. After Freddie’s death, however, Ada becomes increasingly involved in the Shelby family’s business and political affairs.

Her role expands significantly as the series progresses. Ada proves to be intelligent, politically aware, and capable of managing legitimate business interests, eventually taking responsibility for the Shelby Company’s operations in the United States. This often places her in contrast with Tommy’s more ruthless methods.

A common mix-up is Polly Gray, who is closely involved with Tommy and the Shelby family. Polly is Tommy’s aunt, not his sister. Grace Burgess is Tommy’s wife, while Esme Shelby-Lee is married to his brother John.