Jason Finn is the eldest brother of Ben Finn. His life is detailed in Ben Finn's autobiography, The Life and Adventures of Benjamin Finn. Jason Finn was born the eldest of four children in the small hamlet referred to as Gunk. Raised by shop-keeping parents, who often struggled to buy shoes for Jason and his brothers and put food on the table, Jason led his other brothers in the search for sustenance, money, and entertainment. Eventually, the eldest of the Finns found a new source of income for the family-pickpocketing. While Ben would tell jokes to earn money (having recognized the immorality of pickpocketing and not being any good at it), Jason and his brothers would rob the distracted villagers blind.