Ruby Shelby is the daughter of Thomas Shelby and Lizzie Stark. She first appears when Lizzie is waiting for Thomas to come out of the voting hall, where he was representing South Birmingham for the Labour Party. Polly Shelby, her great-aunt, named her Ruby Shelby.
When Thomas won the elections as the Labour MP for Birmingham South Constituency, Ruby is held by Lizzie and then by Thomas, while they go down the stairs.
"A baby. A little you and me."- Lizzie Stark to Thomas Shelby
"It's a girl. Call her Ruby. Ruby Shelby. She'll be a star in a Hollywood movie." - Polly Gray to Lizzie Stark