Who is Finn from Moon Over Manifest and what is their importance?

Finn is Jinx's uncle. Finn is a cruel man who uses people to get what he wants and does not think twice about committing murder to protect himself. Finn uses Jinx from the time his mother dies to scam people out of their hard earned money. However, it is also Finn who teaches Jinx how to survive on the rails. In the end, Finn accuses Jinx of being a jinx, of killing all those who matter to him in one way or another. Finn also accuses Jinx of a murder he himself committed. When the pressure from the law becomes too much, Finn decides to kill Jinx and accuse him of the murder. However, a noise distracts Finn, allowing Jinx to get away while Finn dies when his head hits a rock. Finn is buried in a grave that is marked with Jinx's real name, Gideon Tucker.