Finn Shelby

Finn has always been the odd one out among the Shelby brothers. He is significantly younger than the others and therefore did not fight in World War I. His brothers view him as weak, immature, and lacking in experience. They believe he lacks the ruthlessness of a "real" Shelby.

Arthur Shelby is Finn's older brother and the closest to him out of the four. He and Aunt Polly raised Finn when their mother died and their father abandoned the Shelby family. Perhaps this is why Arthur tries so hard to keep Finn out of the illegitimate business. Arthur and Finn are first seen together in season 2, on the day of the grand reopening of the Garrison Pub. Arthur cries when Finn finally becomes an official Peaky Blinder and is invited to sit at the table at a family gathering.

Thomas Shelby is Finn's second oldest brother. Tommy rescued Finn from his car when he was younger after the Lees rigged it with a hand grenade. Finn tells Tommy that he was just pretending to be him, but Thomas warns him after the booby trap goes off that that is exactly why he should never pretend to be like him. When Finn is older, Thomas allows him to stay for a family business meeting, whereas normally they would never include him as Polly wanted to protect him from it. Finn looks up to his brother, aspiring to be like him and be part of the Peaky Blinders.

Polly Gray is Finn's paternal aunt. Due to the death of his mother, his father's abandonment, and his brothers' departure for war, Aunt Polly has been Finn's sole caregiver. Polly is very protective of Shelby, the youngest, and this may be further exaggerated by the loss of her own children, Michael and Anna. Polly is very vocal about her disapproval of Finn's role within the Peaky Blinders and clashes with Tommy over this issue frequently.

John Shelby is Finn's third oldest brother. He is often seen giving Finn a hard time. Whether it's pushing him, hitting him in the head, or knocking a drink out of his hand, John likes to flaunt his big brother privilege to the only brother he can do so with. This can also be amplified by their closeness in age.